NGK Spark Plugs are designed to operate over a much wider heat range than ordinary plugs. They resist carbon buildup and preignition. Each features high alumina ceramics for better heat transfer and electrical insulation. A patented triple gasket sealing process eliminates the possibility of combustion gas leakage, and a longer insulator nose prevents misfiring. A solid copper core and its nickel tipped electrode provide a longer plus life. Features. Designed to operate over a much wider heat range than ordinary plugs. Resists carbon buildup and preignition. High alumina ceramics for better heat transfer and electrical insulation. Solid copper core and nickel tipped electrode provide a longer plus life. Patented triple gasket sealing process eliminates the possibility of combustion gas leakage