The Reese Pro Round Bar weight distribution system is engineered to provide more features and superior ride performance to other systems. Designed to evenly distribute weight and reduce trailer sway, and improve stability for added ride control and security. Tapered spring bars provide constant weight distribution over the axles for superior ride comfort. System includes: Head with preinstalled 2-5/16" ball, tapered spring bars, deep drop shank, control brackets, lift-assist bar and all hardware necessary for an easy install. Limited Lifetime Warranty.