This is a mouthpiece pipe made by Butler, a company that manufactures carbon fiber wind instrument accessories. It's a short-type mouthpiece pipe for Shires large-bore trombones. It has a calm, warm tone, but I'm selling it because it's not quite to my liking. For tenor bass trombones. I used it with a Q Alessi. There can be individual differences, so if it's too tight, please ask a music store to adjust it.