The AMP orange elk diaphragm is that lightest latex of the new AMP diaphragms.  This is a single reed that produces high pitched cow and calf sounds along with...

The AMP green elk diaphragm is a great all around diaphragm.  This is a single reed that produces medium cow sounds and medium bull sounds.

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...