Protect expensive spark plug wire sets from potential burning, cracking, and hardening typically caused by severe under hood heat. Easily installs on wire by removing distributor boot and sliding Protect-A-Wire(TM) over spark plug wire. Buy in bulk with these 50 foot rolls of Protect-A-Wire. Great for shop use so Protect-A-Wire(TM) is always in stock. Bulk spool is great to have on hand for any project 50 ft bulk rolls 8mm ID Constructed from high temperature resistant glass fiber material Protects electrical wiring, speedometer cable, hoses & more Spools do not include Hi-Temp Shrink Tubes Note: Items with custom cut patterns and/or custom cut lengths of material cannot be returned.