Genuine OEM Volkswagen Alternator V-Belt, part number 04L903137B. This multi-ribbed belt is responsible for transmitting power from the engine's crankshaft to the alternator and other essential accessory components. It ensures the alternator charges the battery and powers electrical systems effectively. Made from high-quality rubber compounds, it weighs approximately 0.094 kg. Using a genuine OEM V-belt guarantees the correct length, rib profile, and material strength for proper tension, reduced slippage, and a long, quiet service life.