This is a Glanz trombone mouthpiece. Large shank Throat: 6.8, Cup: 1 Backbore: 4 Silver-plated finish I bought this new, but I'm selling it because I'm mainly using other mouthpieces and instruments. I only used it twice: once for a trial and then once more. There are very slight scratches on the shank, but it's almost unused. The cup and backbore both come with the original box.