Rath R9 independent bass trombone. R9 Hagmann rotor set.562" bore BRONZE hand slide.. 9.5" yell...The options available for Michael Rath custom bass trombones are extensive, allowing you to configure an instrument unique to you. Available in a single valve model, the R8, and double valve independent and dependant models, the R9 and the R9D, the modular construction allows significant tailoring of an instrument. The standard dimensions for the R8 and R9 are a bore size of 0. 562 and a bell flare diameter of 9 but other sizes are available on
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