Proma Star single adjustable custom mount coil-over shock. Compressed height of 13", extended height of 21-3/4". Bushing top and bearing bottom. With QA1's Proma Star single adjustable coil-over shock, you can easily adjust your compression and rebound valving and get the hard-core performance you need. One knob allows you to choose from 18 valving options that adjust both compression and rebound valving simultaneously, allowing total suspension control in one easy-to-reach location.