Used for about six months on a euphonium after purchasing it second-hand. I am selling it because I bought another Greg Black mouthpiece. It is deeper than the 5G, so I think it will suit the rich tone of the euphonium. There are fine scratches that can occur when inserted into the shank. Please consider this item as used. There is no original box, so I will wrap it in cushioning material (bubble wrap) and ship it. 5GD: Cup Inner Diameter: 25.8mm Cup Depth: Medium Deep (deeper than 5G) Rim Width: Medium Wide