Genuine OEM Volkswagen Piston Rings, part number 06A198151E. These rings are crucial for sealing the combustion chamber, preventing combustion gases from escaping into the crankcase, and controlling oil consumption by scraping excess oil from the cylinder walls. They are typically made of durable metal alloys designed to withstand high temperatures and pressures within the engine. Proper sealing by these rings is essential for maintaining engine compression and optimal performance.