The Bilstein B6 2001 BMW 525i Base Wagon Rear 46mm Monotube Shock Absorber is a high-performance shock absorber specifically designed for the 2001 BMW 525i Base Wagon. It features a 46mm monotube construction with a gas-pressure design for superior performance and durability. The shock absorber is designed to provide an improved ride quality and maximum control, even in the most extreme conditions. It is built to last and provides an enhanced driving experience.