Designer plug wire sets come in distinctive, highly visible colorsHave the plug boots and terminals already installedBoots and wires are made from extra-high-temperature silicone, which gives protection up to 600°FSpiro-Pro core provides up to 10 times the conductivity of a standard carbon-core wireLow resistance means they run cooler and last three to four times longer than carbon-core wiresDesigned for electronic ignitions, but also work great on point typesMade in the U.S.A.