This series of mouthpieces was developed at the suggestion of Jean-François Madeuf and in collaboration with him, as well as with Julian Zimmermann, which is only available with a flat edge. The Bull models served as the basis for the concept of these mouthpieces, which are modelled on a historical bore. They are intended as a supplement to the Bull series. All MZ models show a pronounced centering and guidance of the tones in the middle register. With their bright, brilliant sound and large drawing area, these mouthpieces are excellently suited for playing on holeless long trumpets.