Vandoren Black Diamond BD5 Bass Clarinet MouthpieceThe Vandoren Black Diamond series of clarinet mouthpieces features a new mouthpiece design both internally and externally. The new designs give a player a full sound that is rich in depth of color. This is especially true in the upper register of the clarinet. The BD5 Black Diamond bass clarinet mouthpiece physically feels very similar to a Bb clarinet mouthpiece. It is very responsive while providing a round, full body of sound. The BD5 has a 1. 87mm