The "Sound Plate™" automatically positions the call in your mouth at the right place and angle, making calling elk easier. The Imperial Plate™ Double has 2 reeds with a "V" cut in the second reed, which is perfect for cow, calf talk and herd bull bugles. Features: Angle of the sound plate is set at 30 degrees Large "V" cut in second reed produces cow and herd bull sounds. Also "V" cut adds raspy sounds of the herd bull's growl, bugle and chuckle US Patent Nos. 5,415,578 & 5,520,567.