Gallery Solutions Custom Bevel Cut Double Black Mat for 11x14 Picture Frame with 8x10 Opening Mat is standard 4 ply paper material made of lignin-free and pH-neutral materials Fits into a 11 inch x 14 inch picture frame and with an actual opening size of 8 inches x 10 inches Adds contrast, depth and dimension to any 11x14 picture frame NOTE: This listing is for a pre-cut mat insert and not a frame