ACCEL 7920R Performance 8mm 300+ ThunderSport Ferro-Spiral Custom Red Spark Plug Wire Set 8mm, 550 degrees Fahrenheit double silicone constructions with a fiberglass braid Ferrite Electromagnetic Interference/Radio Frequency Interference suppression element with conductive coating Heavy-duty, spiral-wound, copper-nickel alloy conductors Backed by Accel's Limited One-Year Warranty 150 ohms per foot of resistance