The Primos Raghorn Ridge Elk Diaphragm Call Series are premium mouth calls designed for serious elk hunters. These calls are excellent for high pitch cow and calf sounds. The Belle is produced with our Sound Plate, which automatically positions the call in your mouth at the right place and angle, making calling easier. Set at 16 degrees the sound plate is at a perfect angle for producing cow, calf, and spike bull bugles. Automatically positions for cow, calf, and spike bull calls.