Thank you for viewing. WARBURTON P.E.T.E. PRO Personal Embouchure Training Exerciser Pro Silver, silver plated This is an embouchure training device. At the time of its release, Mr. Eric Miyashiro also recommended it. The disc part is smaller than the standard type, and it is a type with a heavier load. A dedicated case is included. Please consider this item with the understanding that it is a used product.