B. Tilz Mc William mouthpiece for French horn, size 1, with gold rim inner. - Model: Mc William - Brand: B. Tilz - Size: 1 - American shank - Gold rim inner Please check other sites for specifications. There are some minor scratches near the shank due to a habit of twisting it when inserting. The gold rim inner is easy to use, and I used it regularly with my previous instrument. I am selling it because I switched to a different mouthpiece when I changed instruments. I have lost the original box, so it will be shipped in a box from the same manufacturer. Thank you for your understanding.