Genuine OEM Volkswagen V-Belt Pulley With Vibration Damper, part number 027105243. This pulley is mounted on the crankshaft and is part of the engine's accessory drive system. It incorporates a vibration damper to absorb torsional fluctuations, ensuring smoother engine operation and protecting other components. The pulley's precise balance and material composition are critical for engine longevity. Genuine OEM parts provide the exact mass, balance, and durability required for proper engine function.