Shires STBQ33 Q Series Small Bore Tenor TromboneTBQ33 The Q33 Small Bore trombone is a versatile instrument, ideally suited for jazz and commercial environments, as well as for lighter classical music. The 8 inch, two piece, yellow brass bell with soldered bead gives the Q33 a crisp, clean sound with the power and projection for which S. E. Shires instruments are famed. The nickel lightweight handslide in . 508 bore yields quick response, crisp articulations and a brilliant sound with an open low