Accent Design Pre-cut Photo Mat Boards 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. Acid free but for Non-Conservation Framing. Double layer mat with both layers having beveled, White core, inner edges. 2 rectangle openings both measure 6 1/2 x 4 1/2 inch. White upper mat with Black inner mat.