Genuine OEM Audi Alternator Pulley, part number 038903119D. This pulley is a critical component that transfers rotational energy from the engine's serpentine belt to the alternator, enabling it to generate electrical power. It features a multi-ribbed design for optimal belt grip and efficiency. Weighing 0.406 kg, this pulley is engineered for precise balance and durability. Choosing a genuine OEM alternator pulley ensures correct belt alignment, minimizes vibration, and provides reliable, long-lasting performance for the charging system.