The Bilstein 16-19 BMW X1 w/ Standard Suspension B4 Rear Twintube Shock Absorber is a high-performance shock absorber designed to provide superior handling and stability for your BMW X1. This shock absorber features a twintube design that helps to reduce body roll and improve overall ride comfort. It is constructed from high-quality materials and is designed to last for years. With its advanced technology and adjustable damping, this shock absorber is the perfect addition to your BMW X1.