Flextone Calls Green Thunder Double Reed Duck Call The green Thunder Series features easy-blowing Duck calls great for beginners and advanced callers alike. The soft, low-end quacks and aggressive feed chatter will fool even the wariest mallards. These calls are great for hunting pot holes, marshes, timber and open water on light, windy days. Constructed of durable polycarbonate and aluminum, they'll perform well and look great for years. Features: Easy to Use double reed call Great for beginners Hand tuned and guide tested Molded Polycarbonate in Flextone orange Creates soft, low-end quacks and aggressive Feed chatter that will fool even the wariest mallards