The Myler Pelham Ported Barrel Bit has a Myler MB 33 mouth. Myler stainless steel 4.5″ Pelham has a stainless steel Ported Barrel (MB 33) Copper Inlay Mouth to encourage salivation. This is a Myler LEVEL 3 English bit. The higher wide port offers more tongue relief to the horse than Level 1 or Level 2 Myler bits. It is the mildest Myler mouthpiece with the most tongue room. It does not rotate onto the tongue and applies little to no tongue pressure. It works primarily off the bars, lips, chin, and poll. The 1 1/2″ port is not high enough to apply significant palate pressure. For more information on Myler bits visit their website.