Sumax 8mm Universal Spark Plug Wires For Harley For enhanced engine performance, Sumax high-quality silicone-jacketed plug wires are essential. They ensure optimal electrical conductivity and power delivery, replacing old and inefficient spark plug wires to maximize horsepower. Features: Designer plug wire sets come in distinctive, highly visible colors Plug boots and terminals already installed Boots and wires are made from extra-high-temperature silicone, which gives protection up to 600F Spiro-Pro core provides up to 10 times the conductivity of a standard carbon-core wire Low resistance means they run cooler and last 3-4 times longer than carbon-core wires Designed for electronic ignitions 24 lengths Sold in pairs Made in the USA Note: Image depicts various plug end styles for color illustration purposes only all plug ends are 90 and all coil ends are 180.