Quality brass mouthpieces contribute to the high regard Yamaha has earned among beginning and professional musicians alike. The result of a special approach to design and manufacture, Yamaha mouthpieces deliver the performance and comfort required where they are needed most: where instrument meets musician. The mouthpiece production technique used by Yamaha promises consistent quality mouthpieces, time after time. Other manufacturers use a specific cutting tool to create every mouthpiece, which causes problems as tools start to wear. This can result in inconsistent quality and poor performance. Yamaha's computer-aided design system and computer controlled lathe work together to produce the most precise, consistent mouthpieces in the world. | Standard Alto Horn Mouthpieces Specifications | | Model | Rim | Cup Depth | Throat | Backbore | Playing Charateristics | | Inner Diameter | Contour | Thickness | | 37C4 | 18.6 | semi-flat | standard | standard | 5.25 | standard | Medium inner rim diameter and cup volume. Bright tone. Easy to play from the lowest to highest notes. Outstanding endurance. | | 38D4 | 18.9 | semi-flat | standard | Semi-deep | 5.25 | standard | Large inner rim diameter and a fairly deep cup produce a rich, heavy tone. | | 
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