NGK standard plugs are constructed for longer life and optimum performance. The NGK KR9E-G Spark Plug is a reliable and powerful choice for your engine. With its trivalent metal plating, corrugated ribs, and pure alumina silicate ceramic insulator, this spark plug provides superior anti-corrosion, anti-seizing, and heat transfer capabilities. Its copper core further aids in heat removal for an efficient and reliable performance. Additionally, triple seals help to prevent leakage.