The "Sound Plate" automatically positions the call in your mouth at the right place and angle, making calling elk easier. The 30 Degree angle of the Sound Plate, the double-reed design and "V" cut in the bottom reed make the Imperial Plate Double perfect for reproducing cow and herd bull sounds. The "V" cut also adds to the raspy sounds of the herd bull&';s growl, bugle, and chuckle.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.