This is a Warburton mouthpiece, favored by studio and big band musicians. It is compatible with Kanstul, Park, and other backbores, except for some. The top is 10M and the backbore is 7. It's a smaller size, designed for easy high note control. For detailed sizes, playing feel, and sound, please search on Net Brass. There are scratches on the shank. There are no major scratches, dents, or plating wear that would affect playing. Please refrain from price reduction comments. Immediate purchase is OK. If you are interested in used or new mouthpieces, please search on Net Brass. net-brass.com Type...Trumpet Type...Trumpet (in C / B flat) Brand...Bach Type...Trumpet