NGK spark plugs are designed to operate over a much wider heat range than ordinary plugs. They resist carbon buildup and pre-ignition. 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 fouling and misfiring. A solid copper core and its nickel tipped electrode provide a longer plus life.. Features Lowers ignition system voltage requirements; Greater ignitability and performance over conventional spark plugs; Trivalent metal plating has superior anti-corrosion and anti-seizing properties; Increased fuel economy and lower emissions; Highly durable against electrical and chemical wear; Performance spark plug; Specifications Dimension: 0.89" H x 0.98" W x 3.43" L; Weight: 0.12; .