8.5mm Super Conductor Spark Plug Wires-in Black! Walking through the pits or car shows, you see a lot of the MSD�s red 8.5mm Super Conductor Spark Plug. This isn�t really a surprise as everyone knows this is the best wire available. But soon you�ll start seeing a new black wire on a lot of engines because the Super Conductor will be available with a durable black jacket! All of the benefits of the race proven red Super Conductor are still going to be wrapped in a new black sleeve. This way restored muscle cars and other detailed engines can take advantage of the Super Conductor�s benefits. * Durable outer black sleeve is a proprietary compound for resistance to high heat and abrasion. * Conductor core features Dupont Kevlar material for increased tensile strength and improved crimping. * Copper alloy conductor has a resistance value of less than 50 ohms per foot. * Forty feet of conductor is wound into a single foot of wire for effective Electro Magnetic Interference Suppression.