Drag Specialties Universal Spark Plug Wire Set For Harley Twin Cam The Drag Specialties universal spark plug wire set is a replacement option for Harley ignition systems. It serves as a practical choice when replacing worn plug wires or refreshing ignition components during routine maintenance. Features: Constructed with silicone throughout the jacket, insulation, and core for high-temperature resistance 38 long Rated SAE Class E J2031 with a continuous operating temperature of 450F Made in the USA