Genuine OEM Volkswagen Poly-V Serpentine Belt, part number 06F903137L. This multi-ribbed belt is responsible for transmitting power from the engine's crankshaft to various accessory components, including the alternator, power steering pump, and air conditioning compressor. It is a critical component for the operation of these systems. Weighing approximately 0.104 kg, this belt is engineered for high performance and longevity. Choosing a genuine OEM belt ensures correct length, material composition, and rib profile for proper tensioning and reliable, quiet operation, preventing premature wear and system failures.