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NGK Standard Series spark plugs are designed for stock replacement applications. These plugs have a hotter spark, which means better combustion--and that improves performance, while producing less harmful emissions. They're available in a variety of options. Get the spark plugs used by winning racers: NGK Standard Series. 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.