HAMMOND DESIGN 5ML Trumpet Mouthpiece The rim size is about the same as a Bach 3, and the ML cup is between a C and a B. I think it's a popular size. The list price is around 28,000 to 29,000 yen, and it's a high-quality mouthpiece. There are some scratches that are not noticeable in the photos, but there are no problems at all with use. It's in beautiful condition.