pads and mats

as a 2019 study showed in athletes who sleep grounded

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so for example a 15 mm clamp starts at 15 mm and expands to 19 mm

The book 'Earthing' by discoverer Clint Ober

Förlängningssladd, 10 m UK double pads and mats10 meter long extension cord for indoor use. This cord is a good accessory if you need to extend the cord from your grounding sheet or other grounding product when the included 5 m cord is not long enough. If you need another grounding outlet in another room, you can put a T splitter on the wire from the ground rod or on the ground clamp to connect the 10 m extension and run the cord to the next room. It is best to attach it to the skirting boards