These are postcard-sized scraps of coated cardboard. They are white on one side and gray on the other. 【Size】10 x 15 cm 【Thickness】0.46 mm (Japanese postal postcards are 0.23 mm) Use them for reinforcing photos or postcards during shipping, as backing cards for accessories, for crafts, etc. Use your imagination! If you would like to change the number of sheets, please comment.