Feature●You will get two picture mats cut for 16x20 pictures. They will fit into any 20x24 frames●The opening is cut to 15.5 x 19.5 to overlap a 16x20 picture. The overlap also helps to mount pictures to the back●These mats are acid free and cut from 4 ply mat boardDescription All of our matting is cut from high quality 4 ply acid free mat board. Each mat is precision cut with beveled edges that show off the beautiful white core of the mat board.