The FES Bit Western Jointed Port/Roller Mouth is designed to make suppling easy, with a port that is broken on each side for independent side movement. This design encourages suppling, balance and flexation in your horse. The shorter, swept back shank decreases the reaction time from your hand to the horse's mouth, making this a mild bit. The flared top rings help to eliminate pinching the horse's cheeks for a more comfortable fit. This bit is made from stainless steel, ensuring durability and longevity. It includes pinchless loose cheeks, a mouthpiece, and a roller. The mouthpiece measures 5", the cheeks measure 6", the port is 11/4", and the bit diameter is 3/8".