ACCEL 300 Ferro-Spiral ThunderSport wires are 8mm oversized ultra-performance wires that will match your original-style distributor and spark plug boots. ACCEL 300 Ferro-Spiral ThunderSport wires have a double-silicone outer sleeve that can withstand up to 550 degrees, and an inner fiberglass braid to keep everything together. ACCEL 300 Ferro-Spiral ThunderSport wires use stainless steel terminals for maximum strength and conductivity.