Pre-cut and have the plug/coil boots and terminals already installedBoots and wires are made from an extra-high temperature silicone that withstands temperatures up to 316°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 will also work on points-type ignitionsAvailable in universal styles with 90°, 180° and 135° plug bootsFeature 61 cm (24") wire leadsSold in pairsMade in the U.S.A.