This is a recycled "green" craft supply product. One dozen black mat board drop outs for craft projects. These pieces have beveled edges being cut outs from larger mats. Each measures approx. 3-3/4 x 5-3/4 (within a 1/4"). The backs are white and may have light pencil marks from being previously used. I use them to draw or paint on, for making product tags, homemade paper and many other uses.