Thank you for viewing. I am selling a trombone mouthpiece. - Greg Black 5GSD .277#1 Regular - For large bore, silver plated - With box This is a trombone mouthpiece. - Cup Inner Diameter: 25.80mm - Cup Depth: Slightly Deeper 5GS (between 5G and 5GS) - Throat Diameter: 7.0mm (.277inch) 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. This is a regular weight 5GSD. The depth is between 5G and 5GS, making it a model that produces a rich sound and is easy to play high notes. Furthermore, it is a very rare model with a .277”/#1 (7.0mm) throat, characterized by a fast breath speed and a bright tone. Personally, I think it is a mouthpiece that is very easy to control despite being a heavy type, and easy to play high notes. Type...Trombone Accessories/Parts...Mouthpiece