AFCO's Reactor Single Adjustable Mono-tube Drag Shock is an economical alternative to a fully double adjustable design. Mono-tube design uses a larger piston for the same body size which gives unparalleled control and consistency. Adjusts rebound without affecting compression for the widest adjustment range in the industry. This 4" stroke shock comes with coil-over hardware. 11" comp x 14.9" extended length= best for 12"-13.5" centers at ride height. Valve range covers 1,000 hp or less applications (for higher hp check out our "Big Gun" series.) Includes coil-over hardware. Recommended 7" or 8" spring sold separately. Clear anodized.