Iridium IX Spark Plug - BR9ECMIX - KTM 2 Stroke 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 anti-corrosion qualities