Introducing D'Addario Reserve evolution Bb Clarinet marble mouthpieces. Designed for the modern clarinetist, Reserve evolution mouthpieces deliver a warm and refined tone featuring quick response and ease of articulation. This new mouthpiece from D'Addario Woodwinds provides clarinetists with greater flexibility for a wide variety of musical styles. Reserve evolution marble mouthpieces harness modern technology, pioneered by D'Addario, to recreate the incomparable mouthpiece craftsmanship of yesteryear. 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.