Manufactured as a one-piece aluminum bugle tube, the Phelps METAL balances the elk hunters' demand for a weight-conscious, compact design and the ability to project loud, crisp calls. The aluminum construction provides more sound than plastic and is engineered to meet the frequency of bull elk. EZ Bugler external mouthpiece utilizes the AMP frame and offers anyone the option to work and produce realistic chuckles and grunts, no matter their calling level. It requires its own unique reeds and replacement gaskets (mouthpiece comes with one of each)