Cup Diameter: 18mm Cup Depth: 33mm Throat Diameter: 4.6mm European Shank Used for about a month with practice twice a week. There are linear insertion marks from attaching to the instrument, but overall, there are only minor scratches, so there are no problems with use. This mouthpiece allows for easy airflow and flexible sound production, but it didn't suit me, so I'm selling it. I purchased it new and stored it at home in a non-smoking environment.