Knight & Hale Fire N Ice Diaphragm Knight & Hale's Fire'n Ice turkey diaphragm call does it all in the turkey woods yelp, cutt, purr and all the rest and it does it with true tones and versatile volume. It could be the only turkey diaphragm you'll use all season long. This high-quality diaphragm features Harold Knight?s favorite style, featuring a .004 custom blended blue latex top reed and two .003 latex bottom reeds. The bottom reed features the famous moon cut. Plus, the Fire'n Ice is built with a new custom-blended latex that is more water resistant, resulting in a longer life and a pure tone hunt after hunt.