MB-50 Tuba Mouthpiece This is a modified version of Arnold Jacobs' mouthpiece, the Helberg model. Used a few times. There are some scratches on the shank, but overall it's in good condition. From the following site: The CANADIAN BRASS Arnold Jacobs Heritage Model is a faithful reproduction of the mouthpiece, created by members of the Canadian Brass who were lifelong disciples of Arnold Jacobs, the legendary musician and educator. This mouthpiece features a deep, pear-shaped design and a larger throat, making it ideal for producing a core, weighty sound. The rim is relatively narrow for a tuba mouthpiece, and its clear, sharp edge effectively produces a stable sound from low to high notes. Cup Diameter: 33mm Rim: 7.5mm Throat: 8.3mm #Tuba #Mouthpiece #Tuba #MB-50 #CanadianBrass