You could say every diaphragm in the Zink line is a Josh Grossenbacher signature since he hand-builds them all. But this one is truly a masterpiece " and his favorite. Stretched to a tight tension with heavy latex the V-notched top reed and short-notched lower reed create a full range of turkey sounds. Whether you want loud raspy volume or clear quiet coaxing the Josh Grossenbacher Signature does it all and then some.