HOYER HERITAGE B10 French horn mouthpiece, silver-plated. This mouthpiece came with a Hans Hoyer 6801GAL that I purchased used. I haven't used it much since I bought it, but it's possible the previous owner used it. There is some dirt that won't come off. It doesn't have a box, so I will wrap it in cloth or bubble wrap for shipping. Inner rim diameter: Approximately 16.7mm Outer rim diameter: Approximately 23mm Rim width: Approximately 3.5mm Cup shape: Rounded V Cup depth: Approximately 28mm Throat diameter: Approximately 4.8mm Cup volume: Approximately 3 ml Weight: Approximately 37g Shank: American