The Zink Calls Nothing But Green (NBG) Polycarbonate Duck Call gives hardcore callers the ability to sound like multiple hens to pull in the most hesistant mallard drake while leaving a little more in your wallet. Designed for greenhead hunters, this mallard-specific single reed call features Zink's Z-Cut no-stick tone channel, giving duck hunters a huge range of tones, while virtually eliminating reed-lock. Made from the same molds as their custom acrylic namesake, the NBG Poly gives hunters the same field-tested and perfected design at a great value. Great call for finishing wary mallard drakes Single reed design Z-Cut no-stick tone channel - wide range of tones, no reed-lock Field-tested and perfected over the years