Myler L2 MB04 Western Dee | Sweet IronThe MB 04 is similar to the MB 02 in that it will rotate on the tongue and apply tongue pressure, however, it has a small (") port that introduces some tongue relief to the horse. The port allows the horse to swallow and move his tongue when he is moving forward and relaxed, which acts as a release or reward. Independent Side Movement Sweet Iron mouthpiece Curved mouthpiece does not pinch lips and bars Copper Inlay