Daytona Twin Tec Spark Plug Wire Set For Harley This universal kit is 7mm and 36 in length with black silicone covering. The Twin Cam has 90 spark plug boots and straight coil boots. Features: Twin Cam has 7mm outer sleeve with spiral core 36 Long 90 spark plug boots and straight coil boots Kit includes plug wires, terminals and boots for many applications Made in the USA