Rocky Mountain Hunting Calls Diaphragm Cow Elk Calls Kit - The C13 package includes: C50 Temptress, C11 All-Star 2.0 and C12 Contender 2.0. The Temptress is an open reed cowithcalf call that has a "Tone Cap" lip positioner with holes in the top to change the tone and pitch of your calls. Simply place your top lip against the Tone Cap and press down on the reed with your lip when you blow. Firm pressure creates high pitches and less pressure creates lower pitches. The green All-Star 2.0 diaphragm was designed by World Champion elk callers, Rockie and Corey Jacobsen. The aluminum TST frame is all one-piece and the latex is stretched to make a variety of cowithcalf sounds as well as the full array of bugles. The white Contender 2.0 diaphragm was designed by Corey Jacobsen. The aluminum TST frame is all one-piece and the latex was stretched to be able to create both aggressive and passive bugles. The Contender 2.0 will also make a variety of cow sounds. The TST diaphragms are designed to be placed further forward in your mouth, behind your front teeth the "Dome" upwards towards the roof of your mouth. This placement helps prevent gagging and give you easier control of the latex with your tongue."