MSD 31223 Black 8.5mm Super Conductor Spark Plug Wire Set Copper alloy conductor has a resistance value of less than 50 ohms per foot for superior spark Ferro-magnetic impregnated core creates an effective EMI choke Forty feet of conductor is wound into a single foot of wire for high EMI suppression; Conductor core features Dupont Kevlar material for increased tensile strength Durable outer sleeve is a proprietary compound for resistance to high heat or abrasion Stainless steel terminals feature dual crimp tabs to grip wire conductor and outer jacket separately