37 5/16 x 4 1/16 x 31" Outer Mirror Boxes. These boxes were designed for the moving industry for packing mirrors and other fragile glass items. Combine with the Inner Mirror Box INNERMIRROR (sold separately) to make a set. Boxes are manufactured from 200#/ECT-32 kraft corrugated. Outer box is printed with "Fragile Glass" and "Do Not Lay Flat" handling instructions. Corrugated boxes are reusable and recyclable. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. Proudly made in the USA