Description This call was designed by World Champion callers, Rockie and Corey Jacobsen. It was designed to be very versatile. It makes a nice variety of cow/calf talk as well as a great array of bugles. #C1 A collaboration of designs by World Champion Elk Callers Rockie and Corey Jacobsen, the Elk101.com âALL-STARâ Tone Top Diaphragm creates the most realistic, easy-to-obtain elk sounds with ease. This is an Elk tone top diaphragm. Make sure you have an âALL-STARâ on your team! The âSlotted Dome TSTâ 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 âSlotted Domeâ upwards to the roof of your mouth, latex down and open end of the diaphragm towards the front of your mouth.