Bilstein XVS Series shock absorbers feature a 46mm piston, steel construction, and a threaded body designed for motorsports applications. These shock absorbers are rebuildable with an available fill plug tool (sold separately). The large volume dual zone nitrogen bulb, with optional base valve, allows for lower gas pressure for increased grip. These shock absorbers are available in non-, single and double adjustable configurations for precise on-vehicle tuning options. XVS Series shock absorbers are ideal for racers looking for a steel, rebuildable design with multiple upgrade options and superior performance.