ACCEL 4000 Series SuperStock Copper Spark Plug Wire Sets upgrade tired OE wires for high-performance street use. A universal design for V8 engines, these easily installed 8mm spiral-core wires have 450-degree-rated silicone jackets in classic ACCEL yellow extruded over sturdy, tightly woven fiberglass braids that guard against current leakage and oil and solvent damage. They come with high-dielectric-strength inner insulation, zinc-plated steel terminals, a coil lead, and both male/HEI-style and female/socket-style distributor boots and straight plug boots.