This protective sleeve has been woven from extruded volcanic rock and is the ultimate in cable protection! It will handle temperatures up to 650C (Our previous fibreglass based product only went up to 450 C). It is also quite strong and abrasion resistant. Sold in a 1 metre pack and available in two diameters: 3mm 6mm Note: Ends will un-weave with excessive handling. Use tape to hold the fibres together while handling and/or secure with a cable tie during installation.