The Rath Custom R3F Bb tenor trombone is a 0.525” instrument that comes with an 8” bell as standard.

The medium/large bore R3 trombone is available with an F valve section with the designation of R3F.

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 R4, you can purchase just the F valve section to fit your instrument.