NGK Spark Plugs CR9EIA-9; Spark Plugs #6289 (4 Pack) Made by NGK Spark Plugs 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.