The Bilstein B8 Performance Plus series is a high-performance monotube gas pressure shock absorber specifically designed to be paired with lowering springs. This shock absorber offers improved handling and a sportier ride while maintaining excellent comfort. Features a 46mm piston for consistent fade-free performance. Product specifications: - Series: B8 Performance Plus - Position: Rear - Internal Design: Monotube - Finish: Yellow Paint Note: This is a single shock absorber. For a complete axle set, please order two units of part number: 24-131773.