Jerome Callet 635CV trumpet mouthpiece. It has an inner diameter of 15.6mm and a slightly shallow cup, making it easier to hit high notes. Although the inner diameter is small, it's easy to use because of the wide rim (cushion rim), which makes it feel less small. In addition to the wide rim, the rim is also rounded, so I feel there's less damage from pressing. There are no noticeable dents or scratches, but it is a used item. There is no box, so it will be wrapped in cushioning material for shipping. This is a family member's item for sale. Please feel free to comment if you have any questions.