This Bugle Tube is built with the V.E.T.T. system so it contains a spring tuned to the precise dimensions inside the specially made mouth piece. The spring creates more volume, stabilizes higher notes, makes raspier low growls and allows for easier octave changes. The Rogue is less than 18â?쳌 in overall length which makes it easier for packing. It is made with a 1 1/2â?쳌 mouth opening and tapered lip adaptor, vibration dampener (Tube Tamer) on inside of the tube and comes fully assembled and ready for use with your favorite mouth diaphragm.