Custom Mount Rebound Adjustable Coil-Over Shock Absorbers For a comfortable compression setting with 18 valving options for rebound adjustment, QA1's Ultra Ride shock is the best for rodding. These shocks are rebound adjustable with a comfortable fixed compression. These lightweight billet aluminum coil-over shocks are made in the USA and offer easy, bolt-in installation and ride height adjustability. They are 100% dyno tested and serialized and serviceable and rebuildable by QA1 authorized service centers.