SNS Series - Suspension Shock AbsorberBilstein SNS Series shock absorbers feature a 46mm piston, steel construction and smooth body designed for motorsports applications. These shock absorbers are rebuildable for easy repair and valve setting changes, and can be converted to a coilover (kit sold separately). SNS Series shock absorbers are available in multiple lengths and are ideal for racers whose sanctioning bodies require an all steel construction with rebuild capability.