ULTIMATE PERFORMANCE - Creating waterfowl calls from Zink requires special attention and most premium materials; Mouthpieces and bells are machined using software that considers every millimeter of every cut, SINGLE REED TYPE - Designed specifically for mallard hunters, Zink Nothing But Green (NBG) single reed offers superior versatility and sound creation; The NBG captures the power of multiple hen mallards, unleashed in an irresistible cone of sound, Z-CUT, NO-STICK TONE CHANNEL - This innovative Nothing But Green hunting duck call features Zink's Z-cut, no-stick tone channel; It is a ground-breaking design that permits a huge range of tones while virtually eliminating reed lock, SUPERIOR QUALITY - Creating our Nothing But Green Polycarb Duck calls, our waterfowl expert secures the reeds and guts and then places the finished pieces together, he hand-tunes every call until he's completely satisfied with the sound, GREAT HUNTING DUCK CALL - The Zink Nothing But Green (NBG) Polycarb Call is molded after its original custom acrylic namesake; Polycarbonate calls integrate premium quality and natural sounds to provide you with the success in your hunt