The Rocky Mountain Hunting Calls RTS Diaphragm Elk Call 3PK includes the #151 Raptor, #152 Elk Slayer, and #153 Da Bull all in one package. With the three calls includes, a variety of both cow and bull elk sounds can be produced. FeaturesRaptor Diaphragm - The latex is precisely stretched to produce the older excited cow estrus whines and cries. It also will create the deeper growls, chuckles and screaming challenge bugle of herd bulls.Elk Slayer Diaphragm - Latex is stretched to create the nasal estrus cow sounds as well as mews, chirps and whines. It can also produce the high pitch satellite bugles and easy octave changes for location buglesDa Bull Diaphragm - A non-latex diaphragm allows the hunter with latex allergies to still use a diaphragm. This call can create a wide variety of cow/calf sounds in addition to bugles.