Primos Ivory Bugler Reed - The "Sound Plate" automatically positions the call in your mouth at the right place and angle, making calling elk easier. The Ivory Plate Single has a "Sound Plate" set at 30 degrees, which is perfect for cow, calf talk and satellite bull bugles. 30 Degree sound plate angle and single-reed design Allows you to reproduce cow, calf and satellite bull sounds all with one call