QA1 7Q74 7Q Series Small Body Shock Twin Tube 7 in. Stroke 4C/4RQA1 7Q74 7Q Series Small Body Shock Twin Tube 7 in. Stroke 4C 4R QA1s rebuildable twin tube shocks offer the performance, consistency and tunability racers demand. Formerly known as 70 series shocks, the 7Q series is a small body bearing mount shock. Racers can choose from 6 and 7 bodies depending on rules and applications. The twin tube design gives you a great feel for the track surface, making them a good fit for asphalt and dry slick dirt tracks.