Genuine OEM Audi Rear Coil Spring, part number 4F0511115CK. This essential suspension component supports the vehicle's weight and effectively absorbs road shocks, contributing to ride comfort, handling, and stability. It is installed in the rear suspension assembly. Weighing 3.401 kg and measuring approximately 0.31 m in length, this spring is made from high-strength steel. Choosing a genuine OEM coil spring ensures the precise spring rate, material quality, and fatigue resistance required for optimal suspension performance and a consistent ride height over time.