This is a set of four brand new, unopened 650MB "MITSUI GOLD CD-R" discs manufactured by Mitsui Chemicals. I purchased these at the time but never had the opportunity to use them, so I am offering them for sale now. If you are interested, please consider purchasing. ■ Product Contents (all brand new and unopened) ・MITSUI CJPWB74N (Blue): 1 disc ・MITSUI MJCDR74MG (Slim Yellow): 3 discs These have been stored in a dark place (closet) at home for a long time. Although they are unopened, I cannot guarantee their functionality due to their age. (Used CD-Rs stored in the same place played back without any problems, but I have not tested the functionality of these specific discs. Please be aware of this.)