PA Specialty Framing Mats let you turn your photos and artwork into dramatic and exciting home decor pieces that can be hung on your walls, displayed on an easel, or even decoratively framed. Double layer mat with both layers having beveled edges. Double Certificate 12"x 16"/8.5"x 11" Cream Core Aqua/Black- Sizes refer to exterior dimension and photo or art size, with inside edge overlapping some of image. Actual inside measurements about 8.25"x 10.75". Aqua upper mat with Black inner mat, both with Natural Cream core bevel. Acid free but for Non-Conservation Framing.