Gallery Solutions White and Black Custom Bevel Cut Double Mat for 8x10 Picture Frame with 5x7 Opening Mat is standard 4 ply paper material made of lignin-free and pH-neutral materials Fits into a 8 inch x 10 inch picture frame and with an actual opening size of 5 inches x 7 inches Adds contrast, depth and dimension to any 8x10 picture frame NOTE: This listing is for a pre-cut mat insert and not a frame