Allows you to reproduce the packs language to one another, by implementing cows, calves, spikes, satellite bulls, mature bull growls, bugles and chuckles, as well as Estrus(TM) cow cries. Becoming the ultmate collection of Elk sounds that will bring the whole heard. A great value Pack includes: Sentry Plate(TM) Single (Model No. 158) Cow, calf, and spike bull sounds Ivory Plate(TM) Single (Model No. 159) Cow, calf and satellite bull sounds Imperial Plate(TM) Double (Model No. 160) Cow and herd bull sounds Hyper Plate(TM) Double (Model No. 161) Estrus(TM) Cow and raspy herd bull sounds Call Case Automatically blow the right sound with this design Supported reeds that won&';t stretch like conventional