This is a superb mouthpiece that provides a noticeable step-up in tonal quality to the Van Doren B45 mouthpiece that I have been using for the past half century.  I was actually shocked to hear the immediate improvement in sound (that may also be partly attributed to my switching to a Rovner Classic Dark1R ligature when I switched mouthpieces) and the reduction in squeakiness that occasionally snuck into rapidly played high notes.  An excellent price for a top notch mouthpiece that all serious clarinet players should consider.  Quick delivery and good packing as well provided by the seller.  Notes throughout all registers seem to have better clarity and brightness to me than with my B45 and a little more resonance; it also seems easier to achieve an sustain a vibrato when I wish to use that