Cooper Core Spark Plug by NGK NGK standard plugs are constructed for longer life and optimum performance. Features Trivalent metal plating Corrugated ribs Pure alumina silicate ceramic insulator Copper core aids in heat removal Triple seals prevent leakage Benefits Superior anti-corrosion and anti-seizing properties Prevent flashover provides superior strength and better heat transfer Applications Universal What’s In The Box? 1 – Core Spark Plug Warranty 60 Day Warranty