3" Cheeks, 5" Mouth. 3/8" Twisted Dog Bone Snaffle. Dee Ring. The Dee ring applies pressure to the horse's cheek on the opposite side of the face from the rein you pull to allow for better flexion. Mouthpiece has 3 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, and last the dog bone contacts the tongue for pressure to help rate and set a horse's head. LIFETIME GUARANTEE provided by the manufacturer - REINSMAN.