Hot Fire Spark Plug Wire Set For Harley Fxcw Features: These wires have 40 ohms of resistance per foot, which gives the highest spark energy transfer and the highest Emi/Rfi suppression They have a Kevlar core center, with a nickel copper alloy conductor wire Very high tensile strength from a small diameter The wires come with a core insulator of braided high strength fiberglass, a high quality silicone jacket, and plug boots with competition sleeving covering the entire length which gives it a bold look at 11.5mm OD