The Sound Plate automatically positions the call at precisely the right angle, making calling easier. The Hyper Plate Double has 2 reeds with a "Y" cut in the second reed, which is perfect for hyper estrus cow talk and heard bull bugles.Primos Hunting is Widely Known as the Premier Elk Calls and Elk Videos Brand on the MarketWill Primos&'; love for the high country shows through with the quality of elk calls that Primos continues to produce year after year. Primos elk calls come in many shapes, sizes, and sounds. When calling elk, being versatile is key; we have put years of recording and research into our calls.Primos Hunting: Speak the LanguagePrimos Hunting is the leader in the design and manufacturing of game calls for elk, deer, turkey, predator and waterfowl. Our commitment in game calls -- to make great products built by hunters, for hunters - also extends to our blinds, shooting accessories, trail cameras, attractants & supplements, clothes and other hunting accessories. You may also know us through our television show Primos&'; TRUTH About Hunting, DVD&';s and Mastering the Art video series.