Bach Cornet Mouthpiece CORP. 10 1/2 C GP GP... 24-karat to pure gold plating finish, applied afterwards. There are many scratches and scuffs. I think there are no problems with playing. Personally, I think I used it quite cleanly. However, since it is a used item, I would like to sell it to someone who understands. I am very sorry, but... Please refrain from price negotiations as I do not accept them. Thank you very much.