MULTIPLE FRAMES There are 6 packs of picture frames in a same size. The black frame works for photo canvas certificate collage poster size 14x18 inches. SAFE MATERIAL Light weight but well made, come with high definition plastic instead of glass, better protection from scratches. Peel protective film on both side before use. FRAME DESIGN Window opening was designed slightly smaller 0.5" than 14 x 18 photo itself in order to hold it steadily while not a defect. EASY MOUNTING Spring type action on the back of the frame, is easy to open and you can load your pictures quickly.