This is a very small fiberglass travel case for a tenor trombone with F-attachment and screw bell flare, made by Marcus Bonna in Brazil. The hand slide fits in its own case which unzips from the main case. To make it work, you remove the F-attachment crook and store it in the compartment underneath the trombone body. It's unusual, but when you need to be really small, this does it. I don't know which instruments it does and does not fit exactly. Most F-crooks will fit in the compartment. Important: make sure the F-attachment outside sleeves of your horn don't protrude past the tuning slide bow or it won't fit. Conn 88HO/88HTO is a problem, 88H closed wrap is fine. Back 42BO and Shires are fine. Photos show a Michael Rath R4F.
The maximum length inside the case is 61cm. MB also make this case in 67cm, 71cm and 74cm lengths. This isn't those. This is the shortest one. Can't get the others right now.
In black nylon with fiberglass shell. Includes shoulder straps and mouthpiece pouch.
Note: This case does not fit jazz trombones, which tend to be narrower and longer. This only fits the orchestral style large tenor trombones that have some girth and a shorter length body and tuning slide.


