Professional's Choice Derby Bit 3 Piece Smooth Dog-bone The fixed cheek leverage bit is will suited for a finished horse. This shank creates lateral flexion and provides hip control, which allows the horse to maintain balance while keeping their shoulders elevated during turns. The three piece smooth dog-bone with a copper roller mouthpiece is comfortable as it lies across the tongue. The smooth bars offer a softer feel. Copper roller provides entertainment for a busy horse and promotes salivation. Mouth: 5 ¾” Cheek: 6 ¾”