By A Mystery Man Writer
Custom BT#4.5 Trombone MouthpieceInner diameter: 1.008″ or 25.603mmBore Size: Standard – .277″ or 7.036mm, Symphonic – .281″ or 7.137mmCup Depth: 1.485″ or 37.719mm The BT#4.5 is available in both the heavy or light weight blank style. It is also available in either the large shank style or the small shank (tenor).
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