Spark Plugs are a critical engine component that provides the spark that ignites the air-fuel mixture that drives an engine. NGK Spark Plugs feature a trivalent plating, a silver-or-chrome coloured finish on the threads is designed to provide corrosion resistance against moisture and chemicals.NGK Spark Plugs are designed to meet or exceed OE standards- this means that all NGK spark plugs will meet the specifications set by the manufacturer of your vehicle. Standard nickel centre electrode Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Corrugated ribs reduce the risk of flashover Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer Copper core aids in heat removal Triple seals prevent leakage