The Bilstein 12-16 BMW 528i xDrive B6 Performance Twintube Shock Absorber - Right Front is a high performance shock absorber designed to improve handling and ride comfort in your BMW 528i xDrive. It features a twin-tube design with a gas-pressurized inner tube and an outer tube that provides a consistent damping force for improved control and stability. The shock absorber is designed to provide maximum damping performance, while still allowing for a comfortable ride. It is also corrosion-resistant and has a long service life.