The "Sound Plate™" automatically positions the call in your mouth at the right place and angle, making calling elk easier. The 30° angle of the Sound Plate™, the double-reed design and "V" cut in the bottom reed make the Imperial Plate™ Double perfect for reproducing cow and herd bull sounds. The "V" cut also adds to the raspy sounds of the herd bull's growl, bugle, and chuckle.