This is a Stork mouthpiece for horn. There are scratches on the shank. Please note: This mouthpiece is a modified product. I purchased it on Mercari a few months ago, and the outer circumference of the rim had been shaved down. Therefore, the rim is thinner than a standard one. There are no problems with its use, and I felt it was easier to control than expected for its inner diameter. It may be a good match for natural horns for high notes. Since it has been used, please understand. Below are the catalog specifications. Manufacturer: Stork Model Number: C8 Inner Diameter: 16.92mm Bore Diameter: 5.054mm Cup Depth: medium deep Shank: American