Myler Western Dee Single Joint MB 09 3/8 5in.Myler Stainless Steel Western Dee, MB 09 3 8" Single Joint, Level 1 The MB 09 is a more comfortable Myler version of the traditional single jointed mouthpiece. Although it lacks the benefits of a true Myler mouthpiece, it has a distinctive curve so the bars of the bit wrap around the horses bar and lips which make the bit more comfortable. Sweet iron mouthpiece oxidizes and encourages salivation. Mouthpiece is 3 8" (9. 5mm) instead of the standard