The product is a set of 4 NGK 5794 IFR7F-8DS Laser Iridium Spark Plugs designed as OEM replacements for the 98079-578BU ignition system. These spark plugs feature a hex thread, ignition heat range resistor, and solid construction. They are suitable for use on various parts of the vehicle, including the front, rear, left, and right sides. The kit includes 4 spark plugs and is compatible with interchange part numbers from brands like Bosch, Autolite, Honda, Champion, and Denso.