AJR Optimum Control Dog Bone Smooth Locking Pelham BitThis high quality bit offers superior control and comfort for both you and your horse. The locks are set at a specific angle, functioning similarly to a Mullen straight bar. The loops that lock on the backside of the mouthpiece prevent backward movement. However, there is still some vertical movement. It engages when your horse applies strength or resists your hand, providing optimal responsiveness. With various rein options, you can adjust the