The Matte Colored Corrugated Mailing Boxes are 125# test and available in a variety of sizes and gorgeous colors. Perfect for small business owners wanting to ship products to their customers in a unique and durable mailing box. Also makes a great gift box and product packaging box. These mailing boxes feature a tab lock tuck top that will keep your items secure. We ship these boxes flat. Assembly is easy to fold together and does not need any adhesives to hold its shape. Sizes are the outside dimensions of the box.Matte Colored Corrugated Mailing Boxes are FDA compliant food safe made from E flute corrugated and contain 40-45% recycled content.Matte Colored Corrugated Mailing Boxes are 125# test (learn about the difference between 32 ECT and 200# test boxes).NOTE: Length is the widest dimension of the opening into the box. Width is the smallest dimension of the opening into the box. Depth is the distance into the box from the opening to the bottom of the box.