Copper Plus SE Spark PlugType: RN12YCHex Size: 0.813"Thread Size: 0.551"Gap: 0.032"-0.038"Material: Nickel Copper AlloySeat Type: GasketHeat Range: 121/Pkg. CHAMPION SPARK / FEDERAL MOGUL 404 Features:Dependable performance. This Champion spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear.Copper Plus - Dependable Performance.Copper core center electrode allows for accurate control of heat range for longer lifePatented TinTac and ULTRASEAL coated shell for maximum corrosion resistancePatented SAC-9 semiconductor resistor for maximum EMI & RFI suppressionBuilt to ISO and SAE standards for proven performance.