Copper Plus
Champion Copper Plus spark plugs have been original equipment on a wide variety of engines for many years. Manufacturers use them extensively in nonautomotive applications, such as lawn and garden and power equipment, although they are no longer specified for many late-model automotive vehicles.
These plugs have nickel alloy centres and ground electrodes, with reasonably good wear characteristics. In addition, the extrusion of copper into the centre electrode allows for increased conductivity and heat control.