AFCO 19-Series big body steel twin-tube shocks are 100 percent dyno-tested, rebuildable, and revalvable, so you can play by the rules and run the most precise shocks in the industry. Their larger body and 5/8" shaft provide increased strength, and features a gloss finish for durability. The twin-tube design and shim stack technology provide consistant results to make it easier on those ''hard-to-get-ahold-of'' race tracks. Made in the U.S.A