Genuine OEM Volkswagen Alternator Poly V-Belt Pulley, part number 07K903119C. This multi-ribbed pulley is an integral part of the vehicle's charging system, transmitting power from the engine's drive belt to the alternator. Its function is to ensure the alternator spins at the correct speed to generate electrical power for the vehicle. Weighing 0.47 kg, this genuine OEM pulley is engineered for precise fitment and smooth, quiet operation, contributing to the longevity and efficiency of the alternator and the entire accessory drive system.