Genuine OEM SEAT Engine Piston Rings, part number 03C198151M. Piston rings are critical components that seal the combustion chamber, transfer heat from the piston to the cylinder wall, and regulate the amount of oil on the cylinder wall. This set includes the necessary rings for one piston. Genuine OEM parts are manufactured to exact tolerances for proper sealing, compression, and oil control, ensuring engine longevity and performance.