Constructed from high temp Basalt Material Withstands 500°F direct heat and 1800°F radiant heat 13 mm ID protects electrical wiring, speedometer cable, hoses, and more up to 13 mm diameter Easily install by removing the distributor boot and sliding Protect-A-Wire over spark plug wire 4 Cylinder Kit Contains: 13 feet of sleeving and 12 Hi-Temp Boot Shrink Tubes