Thank you for viewing. I am selling a trombone mouthpiece. - Greg Black 5GSD Lightweight - For large bore trombones, silver-plated - With box This is a trombone mouthpiece. - Cup inner diameter: 25.80mm - Cup depth: Slightly Deeper 5GS (between 5G and 5GS) There are small scratches, but there are no dents or major scratches, and I think the condition is good. A Greg Black mouthpiece, not widely available in Japan. It's the lightweight 5GSD. The depth is between 5G and 5GS, making it an easy model to play from low to high notes. Because it's lightweight, it responds very well and is easy to control, and I think it's a mouthpiece with a lot of resonance. Type...Trombone Accessories/Parts...Mouthpiece