YBB-641 Professional Rotary Tuba. The 641 offers the player a sound that is reminiscent of the best European tuba makers. The Yamaha YBB641 Series 4 Valve 4/4 BBb Tuba is a fine instrument built in the German tradition and modeled after the early Meinl Weston models. This tuba features a .812" bore with 4 rotary valves designed for superior sound and excellent valve action. This tuba is well suited for any type of playing. The Yamaha YBB641 Series 4 Valve 4/4 BBb Tuba includes a case and mouthpiece and is available in lacquer (YBB-641) finish. The Yamaha YBB-641 has a traditional German sound with a tubing wrap reminiscent of the early Meinl Weston instruments, the long leadpipe and bell of a Miraphones and the resonance of a Cerveny. This horn is a well blended combination that has a voice all its own. All Yamaha wind instruments carry a limited 5-Year warranty. Hand-Lapped Rotary Valves Hand-lapped valves involves a time-consuming finishing process which results in superior valve fit for noiseless, responsive action and easy tone changes. Hand-Lapped Slides Hand-lapped slides achieves the perfect balance between air tightness and smooth action. Nickel-Silver Spatula Keys Carefully positioned nickel-silver spatula keys are strong and are capable of comfortable fast fingering. Ball Joints for Rotary Valve Levers The Yamaha-developed ball joints for the rotary valve levers are durable, yet achieve silent operation and light action. Leadpipe The long leadpipe contributes to a beautiful, dark, smooth tone which blends well with other instruments. Tuning Slide Position The careful positioning of the tuning slide makes it easier to adjust the slides while playing.