The Rocky Mountain Hunting Calls 105 Mellow Mama is designed with two small cuts in the latex to create the soft and mellow sounds of a cow. The “Palate Plate” elk diaphragm call is designed to be placed further forward in your mouth, behind your front teeth, this helps to prevent gagging and gives you easier control of the latex. To operate the call, place the “Palate Plate” upwards to the roof of your mouth, latex down and open end of the diaphragm towards the front of your mouth.