Power Calls Jolt Duck Call - This single reed Mallard duck call is a great all-around call. This traditional J-Frame style call has plenty of horsepower to break high ducks, yet still boasts a great bottom end that will get quiet for finesse calling. Structure: Molded Poly/Acrylic Blend Coloration: Stealth Black Core Guts: Poly Jolt J-Frame Toneboard Reed: Mylar Single Reed Packaging: Clamshell