The Phelps Game Calls Diaphragms are some of the greatest elk calls in the industry. A great starter 3 pack to produce a variety of cow calls and bugles. AMP Black Elk Diaphragm: The AMP black elk diaphragm produces medium to high pitched cow sounds along with producing raghorn bugles with excellent volume.AMP Grey Elk Diaphragm: The AMP gray elk diaphragm is a great all around call with excellent volume. This is a single reed that produces medium to mature cow sounds, along with producing medium to large bull sounds.AMP Green Elk Diaphragm: The AMP green elk diaphragm is a great all around call. With a single blue reed that produces medium cow sounds, along with producing medium bull sounds.
