Goetze Piston Ring Set - 0850290000: Goetze piston rings are designed to provide optimal performance and reliability in a wide variety of engine applications. The 0850290000 set includes four rings for a single piston, with a diameter range of 82.5mm to 83mm. The rings are constructed of high-grade steel and feature a nitrided surface for superior wear resistance. They are designed to provide a secure seal between the piston and the cylinder wall, reducing oil consumption and blow-by.