Dee ring applies pressure to horse's cheek on the opposite side of the face from the rein you pull for better flexion. The mouthpiece has many features to help control a horse. First, it is twisted to add some bite. Next, a three-piece breaks over the bar at an angle to contact new nerves. Lastly, the dog bone contacts the tongue for pressure to help rate and set a horse's head. Golden Glide bushings ensure smooth movement of the cheeks and eliminate any possible pinching.