The 4 pc NGK 90288 DILKAR7M8 Laser Iridium Spark Plugs are genuine NGK spark plug kit designed for direct replacement. Made from nickel material, these spark plugs have a length of 3.700 inches and a height of 3.320 inches. With a voltage rating of 18V, these spark plugs come with a manufacturer warranty of 60 days and are interchangeably labeled as Champion, Denso, Mazda, and Bosch. The pack size is 4, and there is no core charge associated with this product. Ideal for ignition systems, these spark plugs ensure high performance and durability for your vehicle.