PA Double 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. 16"x 20" Collage 20-Openings White Core Antique White/Gold- Has 20 open spots for pictures. Square, oval, rectangle and octagon shapes. Largest window measures approximately 5.5"x 3.5". Antique white upper mat with matte metallic gold inner mat, both with white core bevel. Acid free but for Non-Conservation Framing.