Hot Fire 300 8mm Spark Plug Wires For Harley Touring Hot Fire 300 plug wire set offers a high performance 8mm wire-wound suppression core producing 300 Ohms of resistance per foot. Features: 8mm wire-wound suppression core 300 Ohms of resistance per foot Up to 15 times more efficient than factory wires Available in a variety of colors Note: May ship with Scott Performance branded packaging - wires are identical and produced in the same factory.