Rath R4/F Tenor TromboneThe medium large bore R3 trombone and the large bore R4 are available with an F valve section with the designation of R3F and R4F. Michael Rath also offers the R4 and R4F models with "in slide" tuning, Because of the modular construction of Michael Rath custom trombones you can remove the valve section and replace it with a detachable gooseneck, available as an option, creating a straight tenor trombone. Similarly, if you already own a straight R3 or
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