Drag Specialties Universal Spark Plug Wire Set For Harley Drag Specialties offers this universal spark plug wire set as a replacement for Harley ignition systems. It is a straightforward option for replacing old or worn wires and handling routine engine maintenance. Features: Constructed with silicone throughout the jacket, insulation, and core for high-temperature resistance 40 long Rated SAE Class E J2031 with a continuous operating temperature of 450F Made in the USA