They provide enhanced performance as direct replacements for original equipment wires. Designed to improve original ignition system performance on stock vehicles using either electronic engine management systems or carburetors. This wire set provides exceptional RFI and EMI suppression to permanently eliminate typical performance and fuel-wasting spark energy deterioration of OE and aftermarket carbon conductor wires. They also eliminate performance problems associated with poorly suppressed aftermarket spiral conductor wires on both modern and older engines. The conventional style insulating jacket consists of high dielectric strength silicone rubber insulation, fiberglass reinforcing braiding and a high temperature, high tear strength silicone rubber outer jacket. The flexibility and ruggedness of the cable allows it to be fitted into original 7mm cable holders. Ideal for use on heat-generating LPG (propane) gas conversion engines.