Laser Iridium® spark plugs provide superior ignitability and long service life for your cruiser or sportbike. Smallest tip diameter available Iridium / Platinum surfaces ensure slow wear rate providing stable idle, superior anti-fouling, improved fuel efficiency and lower emissions. Laser welded Iridium center electrode tip. Platinum disc welded to backside of ground electrode provides long life. Trivalent Metal Plating for superior anti-corrosion and anti-seizing. Faster starts and quicker acceleration. Better fuel economy and lower emissions. Best O.E.M. Iridium spark plug available. Original Equipment Manufacturer approved design. Sold individually. Plug model: SILMAR9B9.