The ACCEL Extreme 9000 Ceramic wire sets have an ultra high temperature double silicone construction wire rated at 600-degrees Fahrenheit peak and featuring a Ceramic boot that can withstand up to 2000 degrees Fahrenheit. The wire uses a 500 ohms per foot Ferro-Spiral core developed for performance use. It provides excellent energy delivery to the spark plugs, while providing the highest level of RFI/EMI suppression. The Extreme 9000 Ceramic wires also feature stainless steel spark plug terminals for maximum spark energy to the plugs. Cut-to-fit design fits every application and includes socket and HEI style distributor boots.