Bach 6 1/2. I don't know much about it. I don't know what instrument it's for. I think trombone. Two boxes are show in the picture. If you are the winning bid Please let me know which box you want, or rather which box is for this mouth piece. Im sending the mouthpiece in the photo and one box of your choice.

Please use photos to get the correct specifications of the item. I may have messed up a letter in the description, but I think everything is correct.

Feel free to ask questions