Genuine OEM Audi Piston Rings Set, part number 078198151E. These rings are essential for maintaining compression within the engine cylinder, sealing the combustion chamber, and controlling oil consumption. This set is designed for a single piston. Manufactured from high-strength cast iron or steel alloys, they are built to withstand extreme temperatures and pressures. Genuine OEM piston rings ensure precise fitment and optimal sealing, critical for engine performance and longevity.