12 x 10 x 4 Flat Corrugated Box: The Flat Corrugated Boxes are the perfect solution for shipping small shallow items. With a compact design these boxes are ideal for products such as apparel books picture frames small artwork mirrors and accessories. Made from durable ECT-32 kraft corrugated material they ensure excellent protection during shipping. Sold in bundles of 25 they ship flat to save on both storage space and shipping costs.