Cooper Core Spark Plug by NGK NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Special insulator nose configurations improve throttle response. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage. Features Trivalent metal plating Corrugated ribs Pure alumina silicate ceramic insulator Copper core aids in heat removal Triple seals prevent leakage Benefits Prevents flashover Provides superior anti-corrosion and anti-seizing properties Provides superior strength and better heat transfer Applications Universal What’s In The Box? 1 – Cooper Core Spark Plug Warranty 60 Day Warranty