The Bilstein 18-22 BMW 530e xDrive B6 Performance Shock Absorber - Front is a high performance shock absorber designed specifically to improve the stability and handling of the BMW 530e xDrive. It is a monotube gas pressure design that features a digressive piston with self-adjusting valving, allowing for superior performance under varying road conditions. It also features a progressive rebound damping that helps reduce body roll and improve ride comfort. The shock absorber is constructed from a high-strength steel body and is corrosion resistant for maximum durability.