These Champion Spark Plugs feature a copper core electrode for increased conductivity and sure fire” engine performance. Plugs you can count on, the Champion Spark Plugs we offer boast all the features that make Champion an industry leader. Plugs feature a triple-coated shell for excellent corrosion resistance, and a triple seal assembly that is the strongest in the industry. Precision rolled threads conform to all manufacturers specifications while a copper core optimizes performance and plug life. Key Features Triple-coated shell offers excellent corrosion resistance Triple-seal assembly is strongest in industry Precision-rolled threads conform to all manufacturers specs Copper core optimizes performance and plug life Select plug types offer RFI (Radio Frequency Interference) suppression to protect sensitive electronics Resists overheating under heavy engine loads Made in U.S.A. Plug Selection The plug you select should help maximize engine performance. If you are happy with the performance of the plugs you are replacing, simply reference the unique Champion number that appears on the plug. If you discarded your old spark plugs, consult your owner's manual to determine the correct spark plug for your engine.