This Eldon Trombone ETB-231 is a rotary trombone in the key of Bb and F.
Firstly, it comes with yellow brass outer slide and bell, F-attachment rotor and mechanical rotor linkage. Bore size of 0.5″ and bell size of 8″. Special features include smooth action, exceptional durability and good resonance to the sound. Furthermore, young students can easily play with its comfortable weight and balance.