ACCEL 7030 Performance 8.8mm 300+ Ferro-Spiral Race Universal Spark Plug Wire Set Features silicone spark plug boots, black wire and stainless steel spark plug terminals 8.8mm, 600 degrees Fahrenheit double silicone constructions with a fiberglass braid Heavy gauge copper-nickel alloy conductor Ferrite Electromagnetic Interference / Radio Frequency Interference suppression element Backed by Accel's Limited One-Year Warranty