Manufactured in the USA to the highest standards in the industry, these brush finished 6061 aluminum coil-over shocks have a ten position rebound adjustment, black powder coated silicon wire springs (offered in 200lb., 250lb., 300lb., and 350lb. increments) and a collar nut for a quick pre-load changes. There is a 9/16-inch piston shaft for added strength , urethane bushings and the unparalleled design of the upper and lower shock eyes. 10" closed, 13 1/2" extended.