The Josef Klier 7 E trumpet mouthpiece offers good endurance, as well as a slight treble. Josef Klier USA mouthpieces are copies of the old Mt. Vernon series by Vincent Bach. The mouthpieces are excellently processed, due to the very pleasant rim you have a good endurance. The pleasant wide rim has a positive effect on the endurance. The flat, medium sized cup supports a bright, broad sound, as well as a light high register. So the choice, in the search for a good lead mouthpiece quickly falls on the 7 E trumpet mouthpiece from Josef Klier.