For alto trombone or small tenor trombone. A small cup diameter with a deep E cup and semi-flat #4 rim.
Features: • 24.28mm cup diameter • 5.95mm (0.2344" or 15/64") throat • Deep E cup (standard is C) • Semi-flat #4 rim (standard is #3) • Standard profile blank • Standard backbore • Standard small shank • Silver plated
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