The product is a 4 pack of genuine authentic NGK 2309 Iridium IX spark plugs designed for use in Yamaha PWC 1.8L engines. These spark plugs are known for their high performance and long-lasting durability, making them a reliable choice for improving the ignition system in watercraft. With the trusted NGK brand and specific OE/OEM part number, these spark plugs are sure to provide optimal performance and reliability for your Yamaha PWC engine.