Custom BT#6 Trombone Mouthpiece Inner diameter: .985" or 25.019mm Bore Size: Standard - .277" or 7.036mm, Symphonic - .281" or 7.137mm Cup Depth: 1.314" or 33.375mm
The BT#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).
