Legends Aero-A Adjustable Air Suspension 1311-0103 All the benefits of the new AERO suspension systems above plus six external knob adjustments allow the fine-tuning of rebound damping Provide optimum rebound performance for any given rider weight, personal ride-quality preference or personal riding style Light to heavy riders can fine-tune ride preference Riders with aggressive to casual styles can tune to desired quality or personal preference Made in the U.S.A.