Here is what Yamaha has to say about this instrument: The Yamaha Neo BBb tuba was designed in co-operation with Simon Gresswell to meet the needs of modern brass band performers. The design incorporates a large 500mm diameter bell that keeps the sound focused and clear. This tuba delivers a rich tone and abundant volume that provides the ensemble with a solid and stable foundation. We are proud to be an authorized Yamaha dealer. Please feel free to email with any questions!