I have developed the "San Francisco" series mouthpieces over a period of twenty years. All of these mouthpieces reflect my attention to the love of the craft of mouthpiece making and correct acoustical design. I use only Zinner blanks for my "San Francisco" Bb and Eb clarinet mouthpieces. These fine blanks represent the best in material and consistency currently available. Hans and Carsten Zinner have been extremely helpful in producing a very fine custom blank for me. This blank is not available to other makers and should not be confused or compared to the Zinner blanks used by others.