Jupiter JTU1140 1100 Series Tuba - Key of BBbJupiter JTU1140 4 Valve 3 4 BBb Tuba features a . 661 inch bore plus four mechanical link tapered rotary valves and removable Rose brass leadpipe. Specifications Lacquered Brass Body is produced using state of the art technology to ensure an instrument of the most accurate scale and playability Precision Mechanical Linked Tapered Rotary Valve combined with open wrap design creates a free blowing and responsive performance experience The Wood Frame