Cow sounds should be smooth, which is why the Elkasus was created. The Elkasus has a heavier latex that will stand the test of time while still producing the full range of a cow/calfs vocabulary. This Call Creates a Full Range of Cow and Calf Sounds, Mews, Cow Bugle, and Estrus Buzz. The Elkasus Small Domed Elk Diaphragm Call creates Low, Medium & High Tonal Range Vocalizations for Elk Hunting and Calling.