Last one! This line is discontinued.
The Holton TR181 inline independent double rotor bass trombone is reputed to have established the true bass trombone sound, and is ideal for both symphonic and solo performance.
Its ten-inch red brass bell is styled to maintain a consistent, warm timbre across the dynamic range. The unique G/G-flat attachment can be reconfigured to the player's taste for setting up low C and B-natural.
Manufacturer’s website: conn-selmer.eu