Metal mouthpiece for tenor saxophone. Opening is 7. I bought it used, but I haven't used it much. It's a Chinese product (according to the previous owner's comment). When I tried it, it produced a proper metal sound. Also, it's easy to control and has power, and the build quality is very precise. The reed fixing hardware is integrated, so a ligature is not needed. A tool for attaching and detaching the reed holder is also included. I don't recommend it for people who are serious about playing, but it might be okay for those who want to casually enjoy a metal sound. There is a thin, shallow scratch on the table, but it didn't cause any problems when playing. Thank you for your consideration.