Silver Tellus Tungsten Grounding Box
Usage Guide
Grounding
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Item code: Silver Tellus Tungsten Grounding Box
Inc. VAT (20%) · Ex. VAT: £1,833.33 Ex. VAT · Inc. VAT (20%):
Lowest price in the last 30 days:
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If you've seen a better offer for this product, we will endeavour to match it. The competing offer must be on brand-new boxed items, and in stock from another UK Online Authorised Retailer (excluding marketplaces). Price match quotations are valid for 7 days.
SPEAKER CABLES:
A quantity of 2 means you will receive a pair of speaker cables e.g. for your front left and front right speakers. By entering a quantity of 1, you will get a cable for a single speaker e.g. centre speaker and this option also enables you to vary the length (and termination) of your cable for each speaker.
OTHER CABLES:
A quantity of 1 means you will receive a single cable in the case of aerial, satellite, subwoofer, digital coaxial & optical cables and a pair of cables in the case of 2 rca to 2 rca analogue audio cables.
NON-CABLE PRODUCTS:
A quantity of 1 means you will receive 1 of the specified products.
Order before 4pm (Mon–Fri) for same-day dispatch
Silver Tellus Tungsten Grounding Box
The Entreq Silver Tellus Tungsten is a two-chamber grounding box and the completely redesigned successor to the original Silver Tellus, which has been Entreq's best-selling ground box for well over a decade, used by thousands of listeners worldwide. Rather than treating every connected source the same way, the Silver Tellus Tungsten separates the system into two discrete chambers, so analogue and digital signal paths can be grounded independently through their own dedicated connections instead of being drained into a single shared cell. That separation matters because digital sources tend to generate a different character of electrical noise to analogue ones, and keeping them apart inside the ground box helps each cell do its job more effectively.
Each chamber carries two copper binding posts, giving four connections in total, so a system could ground two digital sources and two analogue sources at once, or dedicate the box entirely to negative speaker terminal grounding on an amplifier, or a mix of source and power distribution grounding depending on what the system needs most. Inside, Entreq has updated the mineral mix to match the tungsten and titanium formulation used in its flagship Olympus Tungsten boxes, and the chassis itself has been improved for greater resistance to vibration. The box sits on custom-made aluminium spikes for a stable, decoupled footing, and Entreq recommends pairing it with an Eartha ground cable, with the Eartha Olympus offering the highest performance, alongside the Sudoku, Revelation and Apollo options.
With a working mass rating of 10kg to 100kg, the Silver Tellus Tungsten is built to handle everything from a single component up to substantial power amplifiers, making it a genuinely versatile mid-range ground box for a whole system rather than just one piece of equipment. At 320mm long, 440mm wide, 155mm high and weighing 20kg, it is a serious, substantial unit built to anchor a system's grounding for years to come.
What Entreq say about the Silver Tellus Tungsten
With a working mass of 20kg and featuring an improved mineral mix including tungsten and titanium, the Silver Tellus Tungsten is a versatile ground box suitable for use in many audio systems. Silver Tellus is undoubtedly our best-selling ground box. Thousands of users worldwide use it, and it can be said that Silver Tellus is something of a legend. We have updated the mineral mix to match the one used in our Olympus Tungsten boxes, and modified the chassis so that Silver Tellus Tungsten now features two separate chambers.
Specifications
General
- Brand: Entreq
- Model: Silver Tellus Tungsten
- Product Type: Multi-cell grounding box
- Range Position: Best-selling, mid-range multi-cell ground box
- Materials: Oak, tungsten and titanium mineral mix, copper, silver
- Chassis: Improved chassis design for vibration resistance
- Feet: Custom-made aluminium spikes (included)
- Effective Mass Rating: 10kg to 100kg
Connectivity
- Cells: 2 separate chambers (analogue and digital isolation)
- Connections: 4x copper binding posts (2 per cell)
- Applications: Digital source grounding, analogue source grounding, negative speaker terminal grounding, power distribution grounding
- Recommended Cables: Eartha Olympus, Eartha Sudoku, Eartha Revelation, Eartha Apollo
Weight and Dimensions
- Dimensions: 320mm (L) x 440mm (W) x 155mm (H)
- Net Weight: 20kg
In the Box
- Silver Tellus Tungsten ground box (4 binding posts)
- Custom aluminium spikes
About Entreq
Founded in 1999 in Sweden, Entreq is a pioneering company that stands out in the audio industry. Unlike many others, they develop, manufacture, and produce their own products, allowing them to maintain a distinctive approach that prioritises performance and avoids imitating other brands or technical solutions. With complete control over every aspect of production, including constructive materials, design, and connective processes, Entreq ensures its products are unique and focused on delivering exceptional results.
Entreq's two-decade journey has been marked by a series of innovations that have revolutionised the audio industry. While renowned for their ground boxes, they have also introduced groundbreaking products such as Audio USB cables, Audio network cables, network switches for Audio, and DC power cables. Other manufacturers have widely adopted these innovations, solidifying Entreq's position as a leader in the field.
At the core of Entreq's philosophy is a commitment to performance above all else. Their founder, a music lover since birth, recognised the importance of optimising sound quality and has prioritised this goal since purchasing his first stereo in 1973. Entreq believes that performance should take precedence over fancy packaging or expensive marketing, as the enduring impact on sound quality truly matters.
Entreq's early focus on ground purification, introduced in 2007 with their groundbreaking product Tellus, set them apart from the competition. While initially met with scepticism, customers soon experienced significant improvements in sound quality, leading to widespread recognition and appreciation for Entreq's theories about ground and the zero point. Today, their ground purification products, including Tellus and Silver Tellus, continue to be regarded as benchmarks in the industry.
Functionality and performance are paramount to Entreq. Their dedication to delivering exceptional audio experiences is evident when you unpack their products. With years of experience and knowledge, Entreq remains ahead of the curve in development, constantly pushing boundaries to create even more efficient power purification solutions.
Choose Entreq for unparalleled audio performance and discover why their innovative approach and unwavering commitment to excellence have transformed the audio industry.
Specifications
General
- Brand: Entreq
- Model: Silver Tellus Tungsten
- Product Type: Multi-cell grounding box
- Range Position: Best-selling, mid-range multi-cell ground box
- Materials: Oak, tungsten and titanium mineral mix, copper, silver
- Chassis: Improved chassis design for vibration resistance
- Feet: Custom-made aluminium spikes (included)
- Effective Mass Rating: 10kg to 100kg
Connectivity
- Cells: 2 separate chambers (analogue and digital isolation)
- Connections: 4x copper binding posts (2 per cell)
- Applications: Digital source grounding, analogue source grounding, negative speaker terminal grounding, power distribution grounding
- Recommended Cables: Eartha Olympus, Eartha Sudoku, Eartha Revelation, Eartha Apollo
Weight and Dimensions
- Dimensions: 320mm (L) x 440mm (W) x 155mm (H)
- Net Weight: 20kg
In the Box
- Silver Tellus Tungsten ground box (4 binding posts)
- Custom aluminium spikes
We use Royal Mail 1st Class services for our Standard Delivery.
Orders received before 4.30 pm Monday to Friday are usually dispatched the same day by FIRST CLASS post (unless premium postal or timed courier services are selected), subject to stock availability. This does not apply to custom-length cables and speaker cables as these require a longer timescale to terminate. This also excludes all cables selected for the burn-in service. Please note, we do not process orders on national holidays in the UK. Over 98% of our orders are delivered the next working day including Saturdays.
Standard delivery is usually within 2 working days, although 98% of all orders are delivered the next working day including Saturdays. In extreme cases, such as delivery to the Highlands and Islands, this may take 3 days.
All items are fully insured and come with an invoice from Future Shop. We use the Royal Mail for delivery of small packages and DPD Local or DHL for items that weigh over 2KG. Items over 2KG are fully insured and will usually be delivered within 48 hours of placing your order subject to stock availability. For international orders, we use FedEx or DHL services where customers have selected this option.
Please note, special orders for non-standard cable lengths may be subject to longer deliver time-scales. This may vary from manufacturer to manufacturer.
We offer 'Free delivery on orders over £99' subject to the following terms & conditions:
- Applies only to orders with £99 or more of items (including VAT at the UK rate), at Future Shop
- Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK (excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL).
- Applies only to deliveries to addresses within mainland UK and Northern Ireland addresses. Applies only to orders that are to be delivered to a single Mainland UK delivery address.
- You will not be eligible for free delivery on your order if any items are cancelled or returned for a refund, bringing the total order amount below £99. Where items are returned, the refund due will be the cost of the item less any postage costs.
- We reserve the right to change or discontinue 'Free delivery on orders over £99 promotion at any time.
- FREE DELIVERY FOR ORDERS OVER £99 OFFER DOES NOT APPLY TO TRADE CUSTOMERS.
UK Postal & Delivery Charges - FIRST CLASS
Free UK delivery on all orders over £99*
| Weight | Price (FIRST CLASS UK POSTAGE) |
| 0g - 1000g | £3.95 |
| 1000g - 1400g | £4.95 |
| 1400g - 1800g | £5.95 |
| 1800g - 2000g | £6.95 |
| 2000g - 3000g | £8.95 |
* Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK.
Free Delivery for orders over £99 excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL.
Special Delivery UK - Guaranteed Next Working Day
We have 99.9% of the UK covered With Royal Mail Next Day Special Delivery. We guarantee delivery to most UK addresses by 1pm the next working day. This includes Northern Ireland, Jersey and Guernsey. Some places take longer to deliver to but we still guarantee delivery within three working days by 5.30 PM.
Please note, Royal Mail Special Delivery for next working day may not be possible where non-standard cable lengths are ordered. If this is the case, the item will be shipped via The Royal Mail Special Delivery service as soon as the cable is custom made.
For orders weighing over 2KG, we reserve the right to ship items using Next Day Pre-Noon Courier Services where Royal Mail Special Delivery option has been selected.
Channel Islands & Northern Ireland
We accept orders from all Channel Islands including Alderney, Jersey, Guernsey and Sark. Unless you select a premium service, Items weighing under 2KG are delivered using our standard UK delivery option above. For items weighing over 2KG, a surcharge may be applied for all deliveries to the Channel Islands as well as Northern Ireland.
European Countries
Deliveries to EU member states are not subject to 20% VAT after December 31st 2020 and therefore the 20% VAT on items is automatically deducted when you log-in, register or proceed to place an order.
The customer will be liable for the VAT at the local VAT rate, duty on the import and the brokerage service fee if applicable. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.
We offer the following shipping services:
- Royal Mail First Class International Airmail Services - Items are usually delivered within 3 to 5 working days
- Royal Mail Standard International Mail Services - Items are usually delivered within 7-10 working days
- DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
- Federal Express International Priority - Items are usually delivered within 24 to 48 hours. FedEx orders must be received by 3.00pm for next day service to most destinations in Europe
- Federal Express International Economy - Item are usually delivered within 48 to 72 hours
We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.
Worldwide - Excluding UK & Europe
Deliveries outside of the UK are not subject to 20% VAT and so the 20% tax on items is automatically deducted when you log-in, register or proceed to place an order.
If applicable, the customer will be liable for the taxes at the local tax rate, duty on the import and the brokerage service fee. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.
We offer the following shipping services:
- Royal Mail First Class International Airmail Services - Items are usually delivered within 7 to 10 working days
- Royal Mail Standard International Mail Services - Items are usually delivered within 15 working days
- DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
- Federal Express International Priority - Items are usually delivered within 48 hours. FedEx orders must be received by 3.00pm in order to ship items the same day, subject to stock availability
- Where the actual weight of the package significantly exceeds the shipping cost charged on orders, we may write to you for an additional shipping charge. For larger orders, items may be shipped in multiple packets at our discretion
We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.
Frequently Asked Questions
Silver Tellus Tungsten Grounding Box
The Entreq Silver Tellus Tungsten is a two-chamber grounding box and the completely redesigned successor to the original Silver Tellus, which has been Entreq's best-selling ground box for well over a decade, used by thousands of listeners worldwide. Rather than treating every connected source the same way, the Silver Tellus Tungsten separates the system into two discrete chambers, so analogue and digital signal paths can be grounded independently through their own dedicated connections instead of being drained into a single shared cell. That separation matters because digital sources tend to generate a different character of electrical noise to analogue ones, and keeping them apart inside the ground box helps each cell do its job more effectively.
Each chamber carries two copper binding posts, giving four connections in total, so a system could ground two digital sources and two analogue sources at once, or dedicate the box entirely to negative speaker terminal grounding on an amplifier, or a mix of source and power distribution grounding depending on what the system needs most. Inside, Entreq has updated the mineral mix to match the tungsten and titanium formulation used in its flagship Olympus Tungsten boxes, and the chassis itself has been improved for greater resistance to vibration. The box sits on custom-made aluminium spikes for a stable, decoupled footing, and Entreq recommends pairing it with an Eartha ground cable, with the Eartha Olympus offering the highest performance, alongside the Sudoku, Revelation and Apollo options.
With a working mass rating of 10kg to 100kg, the Silver Tellus Tungsten is built to handle everything from a single component up to substantial power amplifiers, making it a genuinely versatile mid-range ground box for a whole system rather than just one piece of equipment. At 320mm long, 440mm wide, 155mm high and weighing 20kg, it is a serious, substantial unit built to anchor a system's grounding for years to come.
What Entreq say about the Silver Tellus Tungsten
With a working mass of 20kg and featuring an improved mineral mix including tungsten and titanium, the Silver Tellus Tungsten is a versatile ground box suitable for use in many audio systems. Silver Tellus is undoubtedly our best-selling ground box. Thousands of users worldwide use it, and it can be said that Silver Tellus is something of a legend. We have updated the mineral mix to match the one used in our Olympus Tungsten boxes, and modified the chassis so that Silver Tellus Tungsten now features two separate chambers.
Specifications
General
- Brand: Entreq
- Model: Silver Tellus Tungsten
- Product Type: Multi-cell grounding box
- Range Position: Best-selling, mid-range multi-cell ground box
- Materials: Oak, tungsten and titanium mineral mix, copper, silver
- Chassis: Improved chassis design for vibration resistance
- Feet: Custom-made aluminium spikes (included)
- Effective Mass Rating: 10kg to 100kg
Connectivity
- Cells: 2 separate chambers (analogue and digital isolation)
- Connections: 4x copper binding posts (2 per cell)
- Applications: Digital source grounding, analogue source grounding, negative speaker terminal grounding, power distribution grounding
- Recommended Cables: Eartha Olympus, Eartha Sudoku, Eartha Revelation, Eartha Apollo
Weight and Dimensions
- Dimensions: 320mm (L) x 440mm (W) x 155mm (H)
- Net Weight: 20kg
In the Box
- Silver Tellus Tungsten ground box (4 binding posts)
- Custom aluminium spikes
About Entreq
Founded in 1999 in Sweden, Entreq is a pioneering company that stands out in the audio industry. Unlike many others, they develop, manufacture, and produce their own products, allowing them to maintain a distinctive approach that prioritises performance and avoids imitating other brands or technical solutions. With complete control over every aspect of production, including constructive materials, design, and connective processes, Entreq ensures its products are unique and focused on delivering exceptional results.
Entreq's two-decade journey has been marked by a series of innovations that have revolutionised the audio industry. While renowned for their ground boxes, they have also introduced groundbreaking products such as Audio USB cables, Audio network cables, network switches for Audio, and DC power cables. Other manufacturers have widely adopted these innovations, solidifying Entreq's position as a leader in the field.
At the core of Entreq's philosophy is a commitment to performance above all else. Their founder, a music lover since birth, recognised the importance of optimising sound quality and has prioritised this goal since purchasing his first stereo in 1973. Entreq believes that performance should take precedence over fancy packaging or expensive marketing, as the enduring impact on sound quality truly matters.
Entreq's early focus on ground purification, introduced in 2007 with their groundbreaking product Tellus, set them apart from the competition. While initially met with scepticism, customers soon experienced significant improvements in sound quality, leading to widespread recognition and appreciation for Entreq's theories about ground and the zero point. Today, their ground purification products, including Tellus and Silver Tellus, continue to be regarded as benchmarks in the industry.
Functionality and performance are paramount to Entreq. Their dedication to delivering exceptional audio experiences is evident when you unpack their products. With years of experience and knowledge, Entreq remains ahead of the curve in development, constantly pushing boundaries to create even more efficient power purification solutions.
Choose Entreq for unparalleled audio performance and discover why their innovative approach and unwavering commitment to excellence have transformed the audio industry.
Specifications
General
- Brand: Entreq
- Model: Silver Tellus Tungsten
- Product Type: Multi-cell grounding box
- Range Position: Best-selling, mid-range multi-cell ground box
- Materials: Oak, tungsten and titanium mineral mix, copper, silver
- Chassis: Improved chassis design for vibration resistance
- Feet: Custom-made aluminium spikes (included)
- Effective Mass Rating: 10kg to 100kg
Connectivity
- Cells: 2 separate chambers (analogue and digital isolation)
- Connections: 4x copper binding posts (2 per cell)
- Applications: Digital source grounding, analogue source grounding, negative speaker terminal grounding, power distribution grounding
- Recommended Cables: Eartha Olympus, Eartha Sudoku, Eartha Revelation, Eartha Apollo
Weight and Dimensions
- Dimensions: 320mm (L) x 440mm (W) x 155mm (H)
- Net Weight: 20kg
In the Box
- Silver Tellus Tungsten ground box (4 binding posts)
- Custom aluminium spikes
We use Royal Mail 1st Class services for our Standard Delivery.
Orders received before 4.30 pm Monday to Friday are usually dispatched the same day by FIRST CLASS post (unless premium postal or timed courier services are selected), subject to stock availability. This does not apply to custom-length cables and speaker cables as these require a longer timescale to terminate. This also excludes all cables selected for the burn-in service. Please note, we do not process orders on national holidays in the UK. Over 98% of our orders are delivered the next working day including Saturdays.
Standard delivery is usually within 2 working days, although 98% of all orders are delivered the next working day including Saturdays. In extreme cases, such as delivery to the Highlands and Islands, this may take 3 days.
All items are fully insured and come with an invoice from Future Shop. We use the Royal Mail for delivery of small packages and DPD Local or DHL for items that weigh over 2KG. Items over 2KG are fully insured and will usually be delivered within 48 hours of placing your order subject to stock availability. For international orders, we use FedEx or DHL services where customers have selected this option.
Please note, special orders for non-standard cable lengths may be subject to longer deliver time-scales. This may vary from manufacturer to manufacturer.
We offer 'Free delivery on orders over £99' subject to the following terms & conditions:
- Applies only to orders with £99 or more of items (including VAT at the UK rate), at Future Shop
- Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK (excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL).
- Applies only to deliveries to addresses within mainland UK and Northern Ireland addresses. Applies only to orders that are to be delivered to a single Mainland UK delivery address.
- You will not be eligible for free delivery on your order if any items are cancelled or returned for a refund, bringing the total order amount below £99. Where items are returned, the refund due will be the cost of the item less any postage costs.
- We reserve the right to change or discontinue 'Free delivery on orders over £99 promotion at any time.
- FREE DELIVERY FOR ORDERS OVER £99 OFFER DOES NOT APPLY TO TRADE CUSTOMERS.
UK Postal & Delivery Charges - FIRST CLASS
Free UK delivery on all orders over £99*
| Weight | Price (FIRST CLASS UK POSTAGE) |
| 0g - 1000g | £3.95 |
| 1000g - 1400g | £4.95 |
| 1400g - 1800g | £5.95 |
| 1800g - 2000g | £6.95 |
| 2000g - 3000g | £8.95 |
* Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK.
Free Delivery for orders over £99 excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL.
Special Delivery UK - Guaranteed Next Working Day
We have 99.9% of the UK covered With Royal Mail Next Day Special Delivery. We guarantee delivery to most UK addresses by 1pm the next working day. This includes Northern Ireland, Jersey and Guernsey. Some places take longer to deliver to but we still guarantee delivery within three working days by 5.30 PM.
Please note, Royal Mail Special Delivery for next working day may not be possible where non-standard cable lengths are ordered. If this is the case, the item will be shipped via The Royal Mail Special Delivery service as soon as the cable is custom made.
For orders weighing over 2KG, we reserve the right to ship items using Next Day Pre-Noon Courier Services where Royal Mail Special Delivery option has been selected.
Channel Islands & Northern Ireland
We accept orders from all Channel Islands including Alderney, Jersey, Guernsey and Sark. Unless you select a premium service, Items weighing under 2KG are delivered using our standard UK delivery option above. For items weighing over 2KG, a surcharge may be applied for all deliveries to the Channel Islands as well as Northern Ireland.
European Countries
Deliveries to EU member states are not subject to 20% VAT after December 31st 2020 and therefore the 20% VAT on items is automatically deducted when you log-in, register or proceed to place an order.
The customer will be liable for the VAT at the local VAT rate, duty on the import and the brokerage service fee if applicable. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.
We offer the following shipping services:
- Royal Mail First Class International Airmail Services - Items are usually delivered within 3 to 5 working days
- Royal Mail Standard International Mail Services - Items are usually delivered within 7-10 working days
- DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
- Federal Express International Priority - Items are usually delivered within 24 to 48 hours. FedEx orders must be received by 3.00pm for next day service to most destinations in Europe
- Federal Express International Economy - Item are usually delivered within 48 to 72 hours
We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.
Worldwide - Excluding UK & Europe
Deliveries outside of the UK are not subject to 20% VAT and so the 20% tax on items is automatically deducted when you log-in, register or proceed to place an order.
If applicable, the customer will be liable for the taxes at the local tax rate, duty on the import and the brokerage service fee. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.
We offer the following shipping services:
- Royal Mail First Class International Airmail Services - Items are usually delivered within 7 to 10 working days
- Royal Mail Standard International Mail Services - Items are usually delivered within 15 working days
- DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
- Federal Express International Priority - Items are usually delivered within 48 hours. FedEx orders must be received by 3.00pm in order to ship items the same day, subject to stock availability
- Where the actual weight of the package significantly exceeds the shipping cost charged on orders, we may write to you for an additional shipping charge. For larger orders, items may be shipped in multiple packets at our discretion
We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.
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Silver Tellus Tungsten Grounding Box
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Silver Tellus Tungsten Grounding Box
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