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NGK Laser Iridium Spark Plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, NGK Laser Iridium Spark Plugs are tested to the highest standards to ensure quality and durability. Iridium tipped center electrode durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98% pure copper core prevents the spark plug from overheating while providing reliable starts. Most Iridium Laser spark plugs feature a platinum pad on the ground electrode for even wear in distributorless ignition system.