Stainless Steel 3 3/4" Dee with 2 Hooks, with Stainless Steel Correctional Low Ported Barrel (MB 27PB) Copper Inlay Mouth. About the mouthpiece: the 27PB is a Myler correctional mouthpiece, a ported mouthpiece that collapses on to the outer lip and bars, and rotates on to the tongue. The port, although narrow and somewhat low, allows room for the tongue to pass under the bit. The angles of the port are pronounced, so when the reins are engaged and the mouthpiece rotates on to the tongue, it applies two concentrated points of pressure on the tongue. Because this port is only 1 ¼" high, it will apply little to no palate pressure. The curved mouthpiece wraps the horse’s mouth, allowing more space for the tongue under the bit. Because this mouthpiece collapses and the angles of the port are pronounced, it offers very quick control. Tis mouthpiece also has Independent Side Movement . For more tongue relief and slower tongue pressure, see the 41PB. For the same mouthpiece without Independent Side Movement, see the 27LP. For the curb (solid) version offering more tongue relief, see the 43LP. From The Level Best for Your Horse by Dale, Ron and Bob Myler. ©Toklat Originals, Inc.