Bach 3D Trumpet MouthpieceThe Bach 3D is designed for players who need brilliance, ease, and control in the upper register. With a medium shallow cup and 16. 30 mm diameter, it provides a responsive feel while producing a sparkling, brilliant tone. The medium wide rim adds stability and comfort, while the #76 backbore enhances projection and clarity, especially in the high register. Similar in size to the popular 3C but with a shallower cup, the 3D is an excellent choice for