Hello ( ^ω^ ) First, I would appreciate it if you could take a look at my self-introduction. This is: ● Cardboard 40 sheets A4 size Front: White Back: Gray This is the cardboard attached to the purchased items. It's thick and sturdy, so I use it myself when packing ♫ It's piling up, so I'm giving it away to someone who will use it! The size is A4 size (see photo 4) You can cut it and use it for cards and Cheki photos, as well as flyers, pamphlets, thin books, to prevent bending of memo pads, and as a background for photography (о´∀`о) There may be some folds, stains, and scratches on the corners and front, so please only purchase if you don't mind. Because of the size, it will be shipped as is in a plastic bag. Please understand. Shipping via Yu-Yu Mercari.