The Ported Barrel Mouth Piece (MB 33)
Design: Curved mouthpiece with upward curve and joined barrel in centre.
Function: Puts downwards
pressure on top of bars, does not collapse on the bars and has no tongue
pressure. Each side of the mouthpiece moves independantly. With a low
palate, may exert some palate pressure. Turns into a solid mouthpiece
when asking for a stop. Offers tongue relief.