Yamaha YBB-621 Series 4-Valve 3/4 BBb TubaProduct #483636 Yamaha 483636 IMA Bb Tubas https://www.esnapw.com/rses/ESnapServlet?MerchantNumberSent=63655
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The 621 Series features a .689-inch bore with 4 front action Monel piston valves designed for player comfort and excellent response. The 621 Series also features a 14.3-inch upright yellow brass bell with great projection.