Our Next Generation Series of Waterfowl calls will blow your mind! These calls are made from our exclusive B.I.G. "Real-Tuff" material that breaks the molds of other traditional call companies. The B.I.G. "Real-Tuff" material is guaranteed not to break, crack, or fall apart under the most extreme waterfowl hunting conditions. These calls are the most life-like sounding and toughest calls on the market. Every NG call is individually and precisely made by hand one at a time. Each call has an Delrin insert that holds the guts in solid and creates an air tight seal. Each insert has a "volume tone hole" melted in the rubber for creating the quietest sounds possible. They can be tuned with the Grey B.I.G RIG Guts or with the Custom RWB Guts all by Big Sean himself. The NG Big Kahuna will have a lower and deeper sound compared to the NG Mr Big because of longer overall length and bore. For gut selection, if you are a beginner caller or like a very easy blowing call... go with the Grey B.I.G RIG Guts. But if you're looking for an unbelievable goosey sound and you are a more experienced caller... then for sure go with the RWB Guts. Comes with a Decal and extra reed. Made 100% in the USA. Please allow 4 to 6 weeks for shipping, as these calls are made individually by hand, not by a machine.