Myler Stainless Steel 7" Neil Merrill Stock Shank, MB 12 Low Narrow Port, Level 3
The MB 12 is a solid Level 3 ported mouthpiece. Because the port is a little wider than the 43LP, the tongue pressure that the horse feels on the outside edges of the tongue is even milder than the 43LP. The port on this mouthpiece is 1 ¼", so it will apply little to no palate pressure. Suitable for a very finished horse that requires the occasional very mild reminder. It lacks Independent Side Movement™ so has a more solid feel and shows less rein movement than the MB 43LP or MB 33. Sweet iron mouthpiece oxidizes and encourages salivation.
Notes: For a wider port, see the MB 16. For similar tongue relief with Independent Side Movement, see the MB 43LP.