champion copper plus marine- boxed – qc12pep dependable performance. This champion spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. built to iso and sae standards for proven performance superior corrosion resistance copper core center electrode allows for accurate control of heat range for longer life resists fouling oe type replacement plug copper plus – dependable performance and durability champion copper plus small engine 956m spark plug (carton of 6) application summary: marine