Set of 5 White/ White 8x8 Double Mats to fit 5x5 Photo, Proof, Art This is a set of five 8x8 White/White double mats with beveled cut openings to fit a 5x5 image. The opening size is 4.5" x 4.5" to fit 5"x5" image sized photos or art. These are acid free neutral ph mats with a white core which does not yellow over time like many regular core mats available. These same high quality square mat 5-packs and 10-packs are available in 8x8, 10x10 and 12x12 sizes in white/white, black/black , white/black, navy/light grey, tumbleweed/black and light grey/moss.