Features 4 rotary valves.748" bore16.7" upright yellow brass bellIncludes case and mouthpiece Description Product Description The Allora AATU-105R Series 4-Rotary Valve 4/4 BBb Tuba is the perfect choice for the advancing student, band director, or hobbyist wanting an affordable tuba with rotary valves. This low-maintenance tuba features a .748" bore, and a 16.7" upright yellow brass bell that provides deep, full resonance and strong projection. With smooth action rotary valves the AATU-105R offers excellent playability. Durable construction offers years if reliable performance. Includes a mouthpiece and a molded plastic case with wheels.The Allora line of instruments was developed to offer the student musician an excellent start to their music career, at prices that parents can afford. Allora instruments meet exacting standards for intonation, comfort, and mechanical reliability and are an ideal alternative to renting.