White 16x20 Collage Picture Mat with Rounded Corners for 15 Photos or Pictures (Matting Only) All openings are reduced by 1/2" to overlap the picture size referenced in the listing. All of our matting is bevel cut and has a white core. This listing is for picture matting only The Openings are Bevel cut (1) 4.5" x 6.5" to fit a 5x7 photo or print, (2) 3.5" x 5.5" to fit 4x6 photos or prints, and (12) 2"x3" for 2.5x3.5 wallet photos