This is a handmade mouthpiece for modern horn by "Breslmair" from Vienna. Inner Diameter: 17.9mm Rim: 1 (Rounded and thin, 3.73mm) Cup Depth: MT (Slightly deep) Throat: 4.3mm I was looking for a slightly larger mouthpiece and used this a few times in rehearsals. I am selling it because the size didn't suit me. Purchased in May 2024 for ¥20,790. *There was a scratch-like mark on the appearance from the time of purchase (I have included a photo, but it may be difficult to see). Therefore, I have listed it as "slightly scratched." There is no problem with playing.