The Yamaha YBB201 is a popular student model offering some of Yamaha's pro-style model specification with its quick efficient response and large pro-sized bell. The YBB201 also features a strong warm tone, easy playability, and accurate intonation. 3 top action valves. Bell: 433mm. Bore: 18.5mm. 67C4 mouthpiece. Supplied in lacquer finish.