NGK Standard spark plugs are OE approved and recommended for reliable performance for most automotive and non-automotive applications. NGK Standard spark plugs feature a 5-Rib insulator design to prevent flashover and are also treated with corrosion-resistant plating to ensure ease of installation and removal. Cold rolled threads prevent damage to cylinder head. NGK s triple gasket sealing process virtually eliminates gas leakage past the shell. Solid Copper Core provides superior heat dissipation conductivity and a broader heat range.