The most realistic sounding wolf howler ever!!! The Phelps Wolf Howler Predator Tube produces exceptional low moans while allowing for barks and effortless pitch changes. The EZ Howler mouthpiece accepts replaceable voices built on Phelp's popular AMP frame. The voice consists of three layers of latex with cuts in the two top layers to achieve the perfect wolf tones serious wolf hunters demand. FeaturesProduces low moans and effortless pitch changesBuilt on AMP frame