Yamaha 31B French horn mouthpiece
17.47 mm standard medium-thick rimSemi-shallow(V-cup)3.90 mm throatSemi-wide backboreMedium inner rim diameter with a "V" cup for a "tr…
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17.47 mm standard medium-thick rim
3.90 mm throat
Medium inner rim diameter with a "V" cup for a "traditional" soft horn tone. High volume over a wide range. A good match for horns with a narrow bell.