Big Bore, Big Guts, Big Sound, Specklebelly call. This new call is the easiest to operate Specklebelly call RNT have ever designed due to its built in back pressure. The Barbelly also comes equipped with RNT's very own individually milled (not molded) custom delrin guts! Produces all ranges of Speck sounds from the nastiest murmur to the loudest ear piercing yodel.