Designer plug wire sets come in distinctive, highly visible colorsPrecut and have the plug/coil boots and terminals already installedBoots and wires are made from extra-high-temperature silicone, which gives protection up to 315°C (600°F)Spiro-Pro core provides up to 10 times the conductivity of a standard carbon-core wireLow resistance means they run cooler and last 3-4 times longer than carbon-core wiresDesigned for electronic ignitions, but also work great on point typesSold in pairsMade in the U.S.A.