S.E. Shires Colin Williams Model Rim Inner Diameter: 25.96mm Throat Diameter: 7.18mm Cup: Medium Shallow Large Shank/Silver Plated Equivalent to 4G (Bach comparison) There are scratches on the shank from use, and a slight dent on the tip. There is no problem with playing, but please note that returns are not accepted. The rim is clean, with no peeling of the plating, and the mouthpiece feels good on the mouth. With a shallow cup and a light blank, it's a 4G size mouthpiece that's easy to play.