Up for sale is NGK 1654 ILZKAR7B11 LASER IRIDIUM SPARK PLUG 1654. The vendor part number is 1654. Please read title to know what you are getting. The catalog decription.... is The ultimate in the evolution of spark plug technology and performance from the industry leaderThe iridium electrode is 25% smaller than a platinum electrode, and it’s just 1/4 the size of a conventional nickel electrodeUltra-small-diameter center electrode reduces voltage requirement and extends ignition system lifeNew metal shell plating has enhanced anticorrosion qualities