uBoxes Picture / Mirror Boxes please see photos for assembling the cartonsSet of 3 Picture Boxes for mirrors or artwork4 pieces needed per item4 piece set extends up to 40 X 60 with 4-inch DepthThese boxes are for moving and storage purposes onlyThis picture kit contains 3 sets of larger picture boxes measuring 40 x 60 Consider wrapping pictures in bubble wrap before securing cardboard flaps Fold the cardboard flaps over the picture or mirror and secure in place with tapeAll fragile items should be marked clearly on the boxes and kept together for packing the moving vanDue to their delicate construction hang pictures as soon as possible in your new residence