Stainless Steel Kimberwick Stainless Steel Low Ported Barrel Narrow (MB 43LP) Copper Inlay Mouth. About the mouthpiece: the 43LP is a curb mouthpiece that does not rotate on to the tongue, but instead sits solidly across the bars and lips of the horse’s mouth. The port is narrower than a Level Three mouthpiece, but still o?ers room for the horse’s tongue to pass under the bit easily. Because the port is narrow, when the reins are engaged, the horse will feel a slight pressure on the outside edges of the tongue as the bars of the bit rotate across the bars and outer lips ? a gentle reminder rather than a strong reprimand. The port on this mouthpiece is only 1 ¼" high, so it will apply little to no palate pressure. It’s the mildest of the Level Two-Three mouthpieces in terms of tongue pressure, just one step below a Level Tree mouthpiece. The 43LP also has Independent Side Movement . For more tongue pressure, see the 27LP or the 41PB. For the same bene?ts but with some palate pressure, see the 43HP. For the correctional version of this mouthpiece, see the 47 and 47PB. For the Level Three version of this mouthpiece but no Independent Side Movement, see the 12. From The Level Best for Your Horse by Dale, Ron and Bob Myler. ⓒToklat Originals, Inc.