The Bach 6 ½ AL is one of the best trombone mouthpiece sizes for students. It is a good, medium-deep size mouthpiece that will continue to be the right size for many students as they get older.
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Small shank,
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Medium deep cup,
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25.4mm cup diameter,
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.230" throat,
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402 backbore,
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Medium wide rim,
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Well rounded, silver plated
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Slightly larger than medium with standard size throat and backbore.
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Rich, compact tone and high volume.
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