NGK (3500) PFR6B Laser Platinum Spark Plug, Pack of 1 Laser Platinum spark plugs provide high ignitability and longer service life Dual platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions Laser welded Platinum center electrode tip creates faster starts and quicker acceleration while the platinum disc welded to backside of ground electrode provides long life Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Triple gasket seal eliminates combustion gas leakage