Zink Calls ATM Green Machine Double Reed Polycarbonate Duck Call - Molded after their original custom acrylic namesakes, polycarbonate calls integrate the premium quality and natural sounds you've come to expect from Zink but with the hunter's budget in mind. All polycarbonate calls come equipped with an easy-blow sound system, so even novice callers can produce undeniably realistic sounds. Top of the line Polycarb Double Reed design Z-Cut tone channel for no-stick operation