By A Mystery Man Writer
Custom BT#1.5 Trombone MouthpieceInner diameter: 1.087″ or 27.6096mmBore Size: Standard – .290″ or 7.366mm, Symphonic – .295″ or 7.493mmCup Depth: 1.439″ or 36.550mm The BT#1.5 is available in both the heavy or light weight blank style.
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