You can remove it from brass wind instruments. If you are skilled enough you can produce sounds on it. Depending on the instrument, it may be of such a conventiently small size that you can slip it into any pocket or bag. So small - and so unimportant? No! The mouthpiece for brass wind instruments may seem simple, but the different points raised in the guide paint a different picture. Unlike with wood wind instruments. The brass wind mouthpiece: as sophisticated as it is small.