Genuine OEM Audi Rear Coil Spring, part number 1EA511103K. This spring is designed to support the vehicle's weight and effectively absorb road shocks and vibrations. It is installed as a key component of the rear suspension system. Weighing 3.935 kg and measuring 0.305 meters in length, this coil spring provides robust support. Using a genuine OEM coil spring guarantees the correct spring rate and material quality for consistent ride height and long-term durability.