This is a Greg Black 4GS regular weight mouthpiece. I always kept it in my instrument case as a spare, but I ended up always using my usual mouthpiece, so I'm selling this one. I haven't used it much, so I think it's in relatively good condition, but there is some discoloration on the inside of the shank. There are no ridges, so I don't think the plating is chipped. Large shank Cup inner diameter: 26.10mm Cup depth: Medium