Greg Black 4.5GSD .277 Tenor Bass Trombone Mouthpiece

Thank you for looking.
This is a trombone mouthpiece.
It is a Greg Black, a handmade mouthpiece maker from New York.
The size is 4.5GSD.
Cup inner diameter: 25.95mm
Medium weight.
The .277 is a custom short shank model.
It also features special acoustic treatment, resulting in an astonishingly fast response speed. It pairs well with a variety of instruments, including Getzen, Edwards, Shires, and Bach.
If you are looking to get a new mouthpiece, why not take this opportunity?
We are open to price negotiations and other inquiries.