NGK Spark Plugs - Iridium IX for Kawasaki Ninja ZX6R 2012 -2026 (CR9EIX) Features: Iridium alloy has an extremely high melting point Iridium electrode is 25% smaller than a platinum electrode, and is 1/4 the size of a conventional nickel electrode Fine wire center electrode ensures high durability and a consistently stable spark Ultra-small diameter center electrode reduces voltage requirement and extends ignition system life Corrugated ribs prevent flashover Metal shell plating has enhanced anti-corrosion qualities Copper core promotes heat removal Triple seals prevent leakage Sold individually