ArtToFrames Collage Photo Frame Double Mat with 4-8x8 Openings with Satin Black Frame and Porcelain mat. Comes with Satin Black frame, Styrene, Porcelain mat , backing and a wire hanging set (hardware as shown in the photos). Finished Frame Dimensions: 23" x 23" (Total frame size when hanging on the wall). Top Mat Color: Porcelain. Bottom Mat Color: Black Comes with 4 - 8x8 openings. (Each opening cut roughly 1/4" smaller then the size listed so it holds in your photos nicely) High quality 4-ply double mats ... Lignin Free, pH-neutral. Bevel Cut Edges.