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QA1's single-adjustable shocks adjust both compression and rebound valving in equal measure at the same time. They're intended for cars that see occasional competition duty, but spend most of their time on the street. By simply twisting the knob, users can choose between 12 different settings. We currently use QA1 Stocker Star single-adjustable shocks on Project Street Sweeper, PHR's '68 Chevelle project car.