This is a mouthpiece for a Shires bass trombone. It came with the instrument when I purchased it, but I am selling it because I don't use it. It has been used very little, but there are some marks like fingerprints on the lower part of the cup, as shown in photos 4 and 5. I need funds to purchase a new mouthpiece and would like to sell this quickly, so please feel free to inquire about the price.