Ask any hunter who makes the best game calls and chances are you'll hear the name Primos. Many call companies specialize in making calls for one type of game species. Primos makes calls for every category of game species hunted in North America. Because of its unsurpassed reproduction of a hen's full range of volume, pitch and tone, this is a #1 seller year after year. The Power Crystals super hard surface easily peaks at 15,000 Hz due to a combination of the crystal surface and the acoustics of the pot's internal sound board. For easy handling and control, superb tones and super loud calling, our Power Crystal is the call to choose.