Patrick 85M (Mike Haynes Model) Trumpet Mouthpiece Inner Diameter: 16.256mm This is Mike Haynes' signature model, designed for lead playing with a shallow cup. *This is a one-piece type. There are light scuffs on the shank from use, but no major scratches, dents, or plating wear that would affect playing. As this is a used item, please refrain from purchasing if you are sensitive or concerned.