I received this mouthpiece as a used item from an acquaintance, but I've only used it for practice once or twice because I usually use a U-cup mouthpiece! I don't know the details, but the mouthpiece is engraved with "IR 2ve," so I believe it's an Irelly mouthpiece! The following information is quoted from the Irelly website: ■IR 2VE…Rim Inner Diameter: 17.50mm, Cup Shape: V-cup, Depth: Slightly deep, Bore Size: 4.5mm, Shank: 5/100 taper (American shank) There are no shank dents, and the insertion marks are minimal, so I think it's still usable. I would appreciate it if you could understand that this is a used item that has been handled by several people. (＞人＜;)