QA1 6Q55 6Q Series Shock Twin Tube 5in. Stroke 5C/5RQA1 6Q55 6Q Series Shock Twin Tube 5in. Stroke 5C 5R QA1s rebuildable twin tube shocks offer the performance, consistency and tunability racers demand. Formerly known as 60 and 62 series shocks, the 6Q series is an aluminum large body shock. The threaded body makes it very easy to use in coil over configurations with QA1 kits (sold separately). Racers can choose from 6, 7, 8" and 9 bearing mount shocks depending on rules and applications. They are