The Natural Bone Grunter uses Flextone's tried-and-true rigid reed system surrounded by a soft, flexible body. This allows callers to easily vary tone and inflection for a natural sound unlike anything you've heard in other grunt calls. Move the O-ring to transition to doe or fawn sounds, and adjust the expandable hose to move from young to mature buck vocalizations. It's a powerful call because of the sounds it makes, but also because of the ones it doesn't. The soft body keeps your movements quiet and concealed if your call bangs against any other gear. Your next whitetail hunt won't be complete without this little trick up your sleeve!