Accel SuperStock Wire is designed to upgrade an OE ignition system for high spark delivery levels for street-driven applications. The 450°F-rated silicone jacket is extruded over a tightly woven, rugged fiberglass braid which is applied over a high dielectric strength EPDM (Ethylene Propylene Diene Monomer) inner insulation for spark plug wire performance that exceeds SAE specifications. 8mm yellow, red, black & blue silicone jacket. Best for street-driven applications. Orange and color matched blue, red & black silicone spark plug boots. Pre and post HEI vehicles.