Superior construction for serious power NGK makes plugs for almost every application and riding style Versatile plugs with wide operating heat ranges prevent fouling from running too cool and preignition from running too hot Feature high alumina ceramics for improved heat dissipation and electrical insulation, deep-seated copper core for a wider heat range and a nickel alloy tip for longer life NGKs wide heat range results from using copper wire in place of the iron cores found in many conventional plugs Copper dissipates heat quicker, cooling the electrode and insulator tip Raised pre-ignition rating with high conduction copper and long nose in