Genuine OEM Audi Serpentine Poly-V-Belt, part number 06M903137AD. This multi-ribbed belt is responsible for driving essential engine accessories such as the alternator, power steering pump, and air conditioning compressor. It ensures efficient and reliable power transfer throughout the engine system. Weighing approximately 0.08 kg, this belt is engineered for specific tension and flexibility requirements. Using a genuine OEM belt guarantees the correct material composition and precise length, crucial for preventing slippage, premature wear, and potential damage to driven components.