Wire-wound AFIS Spark Plug Wires have the lowest resistance (50 Ohms per foot) to deliver more energy to spark plugs while offering superior RFI/EMI suppression. The jacket and insulation materials provide the best: high-temperature performance, resistance to dielectric failure, and protection from vehicle fluids. The strongest on the market, AFIS Wires are premium ARAMID fiber with a fiberglass braid and mesh tape for extra strength to improve terminal pull-off resistance. AFIS Wire Sets are manufactured to exact standards using the latest equipment and processes available.