This product is a set of 4 genuine NGK V-Power spark plugs, part number 4536 XR45, designed for gasoline engines. Manufactured in Japan, these vintage spark plugs feature a nickel construction with a hex thread ignition, heat range resistor, and solid surface finish. They are direct replacements and have a standard fitment type, suitable for enhancing the performance of the ignition system in your vehicle. With the OE/OEM part number XR45, these spark plugs are guaranteed by NGK for quality and reliability, making them an essential component for a tune-up kit.