Bass Trombone, brief description
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“Classification
Aerophone, brass wind instrument
Material
Mainly brass, often gold brass; nickel silver (inner and outer slides)
Mouthpiece
Cup-shaped mouthpiece, a little larger than that of the tenor trombone
Tubing
Length approx. 269–290 cm, mostly cylindrical
Bore
A little wider than the tenor trombone, inner diameter 13.8 mm
Slide
Valves
Two valves, lowering the pitch by a fourth (to F) and a minor third (to D)
Bell
Rim diameter 22.8–26.7 cm”