ArtToFrames Collage Mat Picture Photo Frame - 4 4x5" Openings in Satin Black 16
(Each opening cut roughly 1/4" smaller than the size listed so it holds in your photos nicely). Satin Black Collage Double Mat with 4 Opening and 4x6 size. Satin Black Collage Double Mat with 4 Opening and 8x10 size.