Product details:
The 8 mm. The ceramic boots will withstand up to 2000 degrees F. If you are running headers with close tolerances have an engine bay with little room or an RV with boots that melt because of heat these wire kits are the answer for burnt and melting boots. The wire uses a 500 Ohms/ft Ferro-Spiral core developed for performance use. The Extreme 9000 Ceramic Wires also feature stainless steel spark plug terminals for maximum spark energy to the plugs.