ACCEL Extreme 9000 Ceramic wires are the cure for burnt spark plug boots. Each wire is constructed of 8mm ultra-high temperature double silicone wire rated at 600°F that houses Ferro-Spiral core wire developed for performance use. The wires are finished with stainless steel spark plug terminals and ceramic spark plug boots that can withstand up to 2,000°F. ACCEL Extreme 9000 wires provide excellent energy delivery while providing the highest level of RFI/EMI suppression. ACCEL Extreme 9000 ceramic spark plug wire sets are ideal for custom engines, boats, and RVs and are great trackside accessories for when you need to make up a replacement wire. They're available straight or in right angle configurations.