NGK (5588) ILFR6G Laser Iridium Spark Plug, Pack of 1 Designed to operate over a much wider heat range than ordinary plugs Resists carbon buildup and pre-ignition High alumina ceramics for better heat transfer and electrical insulation Solid copper core and nickel tipped electrode provide a longer plus life Patented triple gasket sealing process eliminates the possibility of combustion gas leakage You can depend on NGK for quality and reliability Features laser welded Iridium center electrode tip Faster starts and quicker acceleration Better fuel economy and lower emissions Platinum disc welded to backside of ground electrode provides long life