Quadro Frames 18x18 inch Picture Frame, Black, Style P375 - 3/8 inch Wide Molding Gallery style side loading frame. Assembly is required. High precision components snap together quickly and without tools. Frame Kits include 1/8" thick MDF backing panel, 0.040" thick clear PET facing panel and molding set with concealed corner connectors for assembly and hanging. Moldings are 3/8 inches wide ABS plastic with a metallized mylar surface finish which is virtually indistinguishable from metal. For 18x18 inch images. Outer Dimensions are 18.375x18.375 inches. Visible size is 17.25x17.25 inches Total frameable thickness (image + optional matte ) is 3/16 inch.