The 5125 Series offers Bilstein technology for custom applications. 5125 Series shocks feature Bilstein's superior single tube high gas pressure design for the up most in consistent fade-free performance and long life. Bilstein's patented Deflective self-adjusting valving delivers improved damping control and a smooth ride on all road surfaces at any speed. Self-Adjusting Deflecting Disc Valving High-Flow Piston Reduces Harshness Independent Rebound & Compression Tuning Larger Working Piston Area for Exact Damping Superior Control for Large Diameter Tires Available by travel lengths for custom applications