Over 40 feet of conductor is wound into a foot of wire.
Outer sleeve provides resistance to high heat and abrasion.
That is the lowest resistance of any helically wound wire. To accomplish this, MSD uses a copper alloy conductor due to it's great voltage carrying capabilities. This conductor is wound extremely tight around a special center core. So tight in fact, that there is over 40 feet of conductor wrapped into a single foot of plug wire. This choke, or suppression capability, keeps the EMI inside the wire where it cannot interfere with other electronics on your vehicle.