Reserve Evolution EV-10 Bb Clarinet MouthpieceReserve Evolution Mouthpieces are milled (not molded) from hard rubber for a higher level of consistency; every Reserve mouthpiece is machined to the strictest tolerances. Of course, the true beauty of Reserve lies beyond its polished angles, curves, and proprietary material to something far more remarkable: its sound. Features Precision milling delivers unparalleled consistency, eliminating the need to try many before purchase Revolutionary ramp and