This is a genuine Porsche engine piston ring for the 911 model, with part number 99710337490. It is designed specifically for use in Porsche 911 engines and is made from high-quality materials to ensure optimal performance and durability. This piston ring is an essential component for maintaining proper compression and sealing in the engine, helping to maximize power and efficiency. It is an authentic Porsche part and is recommended for use in all 911 models.