ACCEL Extreme 9000 Ceramic Single Wire Replacement Kits keep you from having to buy a whole new wire set every time one wire gets cut, burned, or broken. The ceramic spark plug boot comes already installed ? all you have to do is cut the 8mm Extreme 9000 ceramic wire to length, install the distributor boot and terminal, and put it on. Ideal for use with headers or in cramped engine bays, this 135-degree spark plug boot can withstand up to 2000 degrees. The kit includes a 60-inch length of 600-degree-rated double-silicone wire with stainless steel spark plug terminals for maximum spark energy to the plugs and unparalleled RFI/EMI suppression.