SK-II Whitening Source Derm Revival Mask. I received this a while ago, but I haven't used it and it's been stored at home for a while. I don't know how to check the manufacturing date, so I'm selling it at a low price. Please understand this before purchasing and using it. I used a mask of the same product from the same year, and the feel was fine. Please note that I will fold the box and repackage it in a bag for shipping. ^_^