Rocky Mountain Calls most-popular elk call, the Raging Bull Elk Diaphragm Call gives you the ability to make a wide range of cow, calf and bull elk sounds. Unlike other diaphragms, this single-light-latex call sets right behind your teeth giving you outstanding sound control. Low tongue pressure delivers low notes and high pressure produces higher elk sounds. The ingenious palate-plate design is easy to blow and the latex is stopped by the palate-plate, so you can't go higher than the right note. Rocky Mountain Calls most-popular elk call Makes a wide range of cow, calf and bull elk sounds Sets right behind your teeth for outstanding sound control Low tongue pressure delivers low notes High pressure produces higher elk sounds Ingenious palate-plate design is easy to blow