Necessary in many high compression applications, NGK Surface Gap Spark Plugs are designed for special, high energy ignition systems. These plugs from NGK operate over a wider heat range than ordinary spark plugs and are built to be immune to pre-ignition. Maintaining all the features of standard spark plugs, multi-ground plugs extend plug life with more ground electrodes. Each NGK spark plug features high alumina ceramics for better heat transfer and electrical insulation. The patented triple gasket sealing process eliminates the possibility of combustion gas leakage Key Features Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator provides superior strength and better heat transfer Copper core aids in heat removal Triple seals prevent leakage Specifications Electrode Material: Nickel Core Material: Copper Plug Selection To ensure optimum performance please consult your owner's manual to determine the correct spark plug for your engine.