This is a J. Michael valve trombone "TB-600V," which is currently difficult to obtain. When new, the list price is over 100,000 yen. Clear lacquer finish Medium-sized dual bore Bore size = 12.70mm/13.34mm Bell size = 204mm Sound can be produced, but since I am not familiar with it, I am selling it as a junk item. Includes mouthpiece. Case is included, but it is not in good condition; the zipper is broken. Please purchase after confirming everything in the photos.