3" Cheeks, 5" Mouth. Designed for the well trained horse to comfortably carry all day long. The headstall ring aligns the mouthpiece at a pleasing angle in the horse's mouth and prevents downward rotation of the mouthpiece when rein pressure is applied. Comparable to an English Kimberwicke without the leverage element. The Trail Dee design encourages relaxation of the jaw because of the limited likelihood the mouthpiece will break down into the tongue or up into the palate, and the Double Five copper inlay will increase salivation. Allow your horse to relax and enjoy the trail as much as you do!