Genuine OEM Audi Rear Axle Frame Balance Weight, part number 4K0505563A. This component is specifically designed to balance the rear axle frame assembly, which is essential for maintaining vehicle stability, reducing vibrations, and ensuring optimal ride comfort. It is installed on the rear axle subframe. Weighing approximately 2.11 kg, this balance weight is manufactured to precise specifications. Using a genuine OEM balance weight guarantees the correct mass and mounting characteristics, which are critical for preventing unwanted resonances and ensuring the intended dynamic performance of the suspension system.