NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Fine wire center and ground electrodes provide enhanced ignitability. Gold palladium center electrode and platinum tipped ground electrode improves ignitability, increases durability and enhances anti fouling capabilities. 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.