"New for 2023 from Rocky Mountain Hunting Calls and Supplies! In collaboration with legendary call maker Rockie Jacobsen, we are introducing our newest, most innovative diaphragm to date. The new NSU ""Next Step Up"" consists of a recessed latex and palate plate that places your tongue in the correct position, allowing even the most novice user to understand how a diaphragm works. This is the easiest diaphragm on the market to use and fits the widest variety of palates. The original palate plate, designed by Rockie Jacobsen, brought a design to the market that has allowed those with a gag reflex to use a diaphragm by placing it further forward in the mouth. With the added NSU technology, it now takes the guesswork out of proper tongue placement.The Monarch (171) is designed for people with a ""Medium Profile Palate Plate,"" which provides a more comfortable fit, allowing for more efficient use of the call. This call features a single latex and produces beautiful mature estrous cow sounds.The Moon Phase (170) is designed for people with a ""Flatter Profile Palate Plate,"" offering a more comfortable fit for more efficient use. This call, built on a medium-low profile advanced NSU frame, is a single latex that produces cow/calf sounds and spike to satellite bull sounds.The Warrior (172) is designed for those with a ""Medium Low Profile Palate Plate,"" providing a comfortable fit for more efficient use. This single latex call, built on a medium mid-profile advanced NSU frame, makes cow/calf sounds and satellite to herd bull bugles."