16x20 Black Collage Mat with White Core for 3 Pictures (1) 3.5x5.5 opening for 4x6, (1) 4.5x6.5 opening for 5x7 and (1) 7.5x9.5 opening for 8x10 All of our matting is bevel cut and has a white core. This listing is for picture matting only Made from 4 ply high quality matboard