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This listing is for 4 IFR6T11 4589 NGK Laser Iridium Spark Plugs. Fitment information is provided in the Product Description below—always verify the correct part number with your vehicle manufacturer, owner’s manual, or NGK directly before purchasing. Offering the quality, reliability and durability you would expect from an OEM manufacturer, NGK is known for being the world’s leading supplier of OEM spark plugs. NGK Laser Iridium spark plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, Laser Iridium spark plugs are tested to the highest standards to ensure quality and durability. Iridium tipped center electrode provides durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98 percent pure copper core prevents the spark plug from overheating while providing reliable starts. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in distributorless ignition systems. Best for vehicles with OE fine wire iridium alloy plugs.