The MB-7 compact is a very thin case that is recommended for midsize horns like Ricco Kühns and Alexander 1103s plus a mute. It will fit Alexander 103s and most Stomvi models, although probably not with the mute.
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Marcus Bonna cases have been an extremely popular choice for brass players since 1991. All MB cases are lightweight, compact, and durable. Fiberglass (or carbon fiber) shell, nylon (or leather) exterior. High-quality stitching and components. Handmade in Brazil.