Thank you for viewing. This is a trombone mouthpiece for large bore trombones, a Laskey 55SY, the signature model of Joseph Alessi. This is for symphony use, not solo use. The size is an inner diameter of 25.5mm (same as Bach 5G) and a throat of 7.16mm. It's a slightly heavy mouthpiece, but not as heavy as a Greg Black medium. I used it for about 2-3 months, but I found another one, so I'm selling this one. There are some scratches on the shank insertion part, but I don't think there will be any problems with use. The list price is ¥51,700 (including tax), but if anyone wants to buy it as cheaply as possible, how about taking this opportunity? (The case in the photo will also be sent.)