Vulcan Extreme 8.5mm Silicone Universal Race Straight Spark Plug Wire Set 8 Cyl Vulcan 8.5mm Extreme Energy wire set has a special wound core that has 500 ohms per foot. 8.5mm silicone cover over a heavy braided glass. Includes terminals for distributors with early type (Socket) and later (HEI or Ford "spark plug top") distributor caps. Straight boots and terminals factory terminated on the spark plug end. Coil wire included