NGK Spark Plugs are designed for improved ignitability and throttle response. The advanced design of Iridium IX Spark Plugs features a 0.6 mm Iridium center electrode tip for superior ignitability without sacrificing durability. They also operate over a wide heat range which suits them to high-performance environments. Key Features Fine wire center electrode provides a consistently stable spark and high durability Iridium alloy offers an extremely high melting point for high performance enginesTrivalent metal plating provides superior anti-corrosion and anti-seizing propertiesCorrugated ribs prevent flashoverPure alumina silicate ceramic insulator provides superior strength and better heat transferCopper core aids in heat removalTriple seals prevent leakage Specifications Electrode Material: Iridium and platinum Core Material: Copper Plug Selection To ensure optimum performance please consult your owner's manual to determine the correct spark plug for your engine.