Jupiter JTU1110 1000 Series Tuba - Key of BBbWith it's big bore, big bell, and 4 front piston valves, the innovative design of the Jupiter JTU1110 tuba is unique. The valve tubing is an open wrap, unlike anything seen before on the market. Specifications Lacquered Brass Body is produced using state of the art technology to ensure an instrument of the most accurate scale and playability Stainless Steel Pistons have remarkably smooth, fast action for improved agility and playability The Wood Frame