Power Calls Charge Acrylic Mallard Duck Call. This single reed mallard duck call is the ultimate mid-range duck call. This traditional J-frame call has enough volume to break ducks, but will get whisper quiet to finish them the last few yards. Built in hold makes for making those soft whines, squeals, and clucks a breeze. Structure: Machined CNC Acrylic Body Coloration: Stealth Black Core Guts: Acrylic Charge Toneboard Reed: Mylar Single Reed Packaging: Watertight Hard Protective Case