NGK Spark Plugs 6499 Spark Plug - LFR4A-E. 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. 4 Pack. Features of NGK Spark Plugs 6499/3001.7374 6499 Spark Plug - LFR4A-E Designed to operate over a much wider heat range than ordinary plugs Resists carbon buildup and pre-ignition 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 Package Contents: NGK Spark Plugs 6499/3001.7374 6499 Spark Plug - LFR4A-E NGK Spark Plugs 6499/3001.7374: 6499 Spark Plug - LFR4A-E