Knight and Hale Glass Hammer Turkey Call (Glass Pot Call) Nasal sound allows for a more realistic turkey hen call Internal soundboard and WIP (Wood Impregnated Plastic) technology Soundboard within a soundboard enhances the Glass Hammer's accuracy by softening the turkey call's highest highs and lowest lows Enables greater volume and a more nasal sound WIP technology provides the sound of real wood with the durability of plastic