Thank you for viewing. [Rim Inner Diameter]...27.22mm [Throat Diameter]...7.25mm [Features]...Custom mouthpiece with pure gold plating. It has a slightly thin rim and maintains a rich sound even in pedal tones. It also has sufficient cup volume, allowing for good breath intake in the low register and achieving a large volume. There are some minor scratches from use, but there are no dents or distortions on the rim or shank. Please understand that this is a used item.