The product is a pack of 4 genuine NGK 97637 Iridium IX spark plugs, specifically designed for gasoline engines. These spark plugs have a 12mm thread diameter and a hex size of 16mm, ensuring a secure fit for optimal performance. The iridium material provides excellent durability and high heat resistance, making it ideal for extended use. With interchange part numbers like DCPR7EIX-Solid and 97637, these spark plugs are a reliable choice for car and truck ignition systems. Shipping includes tracking. SOME packaging may not the greatest but the contents are fine. SOME will ship without original packaging but will be protected for shipping. Will combine to save on shipping