The generously wide port allows room for the tongue to pass under the bit and swallow. Because this mouthpiece does not rotate on to the tongue and the port is wide, it applies little to no tongue pressure, working primarily off the bars, lips, chin and poll. The port on this mouthpiece is only 1 ½" high, so it will apply little to no palate pressure.
Because of the high degree of tongue relief, the horse that goes well in this mouthpiece has a trustworthy and consistent disposition, trained to work off the leg and seat as well as the hands. This mouthpiece has Independent Side Movement.