Protone clarinet mouthpieces are hand-faced in the Morgan shop. These Protones are made of a hard rubber-and-synthetic mix containing 30% natural rubber&mdashdouble the government's requirement of 15% to be called a rubber mouthpiece. ProTone student clarinet mouthpieces are given the same attention as a top-line Morgan model&mdashtheir curves, tip, rails, and more are all cut and shaped by hand to the same exacting specifications....