ACCEL Motorsport Thundersport spark plug wires are half the diameter of stock wires and extremely flexible. Easy to run through cylinder heads, rocker covers, and frame tubes for a totally hidden look. 150 ohms per foot spiral wound core for better performance. High gloss 5mm silicone jacket rated at 550 degrees. Spark Plug Wires, Thundersport, Spiral Core, 5mm, Yellow, Set.