NGK (3130) BR8EG Racing Spark Plug, Pack of 1 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 Fine-wire center and ground electrodes provide better sparking and enhanced ignitability Made to withstand the severe conditions that occur in racing engines Zinc dipped shell prevents corrosion while the triple gasket seal eliminates combustion gas leakage Special configurations are used for the insulator noses to improve throttle response and prevent fouling with corrugated ribs on insulator to prevent flashover Solid copper core for greater spark