11" BDA-51RC 550 LBS. REAR RACING SHOCK WITH RESERVOIR Compatible with Fast Ace Brand New Light weight, ergonomic, adjustable rebound, easy turn adjustable spring pre-load, nitrogen-charged, oil damping with internal floating piston, service friendly Specifications: Aluminum Alloy Spring is Adjustable HD Steel End Piece Length: 11" or 280mm eye to eye length Adjustable rebound F (fast) and S (slow) at the bottom of the shock This is ideal shock for pit bike, ATV, scooter, beach buggy and Yamaha 4 wheel golf cart.