These red 8mm ignition wires are made of silicone with an outer jacket to keep wires flexible while maintaining their color. The spiro-wound core consists of a highly conductive resistor conductor spiral which provides more fire power and up to 10 times less resistance than standard resistor core wires. It is ideal for use with multi-spark discharge ignition systems, electronic ignitions, and on board computer systems. They eliminate radio frequency interference, can withstand temperatures up to 600-degrees F, and feature vibration proof spring locking terminals with 90-degree boots and HEI distributor ends.