This mouthpiece features a hinged port with a center roller. It gives tongue relief while working off of bar and palate pressure. Great bit with embellished silver cheek and jointed sidepieces. Unique ball hinge at cheek prevents pinching. Various mouthpiece options make this a great bit for horses of all levels. Port: 1 , Mouth: 5 , Cheek: 7Size: 5 1/4''