Genuine OEM Audi Alternator Pulley, part number 06E903119P. This pulley is a crucial component that transmits power from the engine's accessory belt to the alternator, enabling it to generate electrical power for the vehicle's systems. It is mounted directly onto the alternator shaft, typically featuring an overrunning clutch mechanism to dampen belt vibrations and improve efficiency. Weighing approximately 0.725 kg, it has a diameter of 0.07 meters and a height of 0.046 meters. Installing a genuine OEM alternator pulley ensures precise rotational balance, correct overrunning clutch function, and durable bearing quality, which are vital for the longevity of both the alternator and the accessory belt system.