|Nothing delivers the sparking power like these ThunderVolt ignition wires. The 10.5mm wires use a ferrite spiral-wound core made with an exclusive copper/nickel alloy bonded by a conductive acrylic latex cover. The result is just 50 ohms/foot of resistance. Plus, they can withstand heat up to 600 degrees F and have 102,000 V dielectric strength. Other features include a heat-treated fiberglass braid, a triple-silicone outer layer, and silicone boots.