Yamaha 31D4 French horn mouthpiece
17.28 mm semi-flat medium rimSemi-deep(double-cup)4.50 mm throatSemi-narrow backboreHeavy tone and high volume. Relatively flat rim of medium thicknes…
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17.28 mm semi-flat medium rim
4.50 mm throat
Heavy tone and high volume. Relatively flat rim of medium thickness for easy playability.