Golden State Art, 13.6x19.7 Matted Black Wood 9-Opening for 4 x 6" Collage Picture Frame IMPORTANT NOTES: IT COMES WITH REAL GLASS. Not Acrylic! This picture frame comes with single mat with 9 openings for 9 4x6 pictures (Opening size: 3.5"x5.5") With 2 hooks for vertical and horizontal hanging options. Bevel cut mat with white core and 4-ply thick (about 1.4 mm or 1/16 inch). 1'' wide and 0.75'' thick molding, Hangs vertically or horizontally