Features 4 Rotary Valves 17 1/2 inch Bell .770" Bell Case with Wheels Ball and Socket Linkage Description Product Description If there were ever a total all in one Rotary tuba design, it would be the Tempest Prague Model. This compact BBb Tuba is well suited for any ensemble situation. The Tempest Prague model features a large, full sound with excellent response and plays with the characteristics of a 5/4 instrument. It produces the sound and intonation associated with instruments costing thousands more. The Tempest 4 valve Rotary tuba is not only very versatile, but it is also very light-weight and portable. Any tubist can perform on this instrument - from a 12 year old to a senior citizen. Lee Hipp of the San Antonio Symphony says "there is no better BBb tuba to be found." You can put it on an airplane, under a bus, or carry it easily in its wheeled case. Reliability has never come with so much versatility in a tuba.