Black Mailer Box is made of recycled cardboard paper. This box provides superior protection for the valuable items. Lightweight but sturdy for shipping. It can be easily used for UPS, USPS and fedex shipping. The tab locking makes this small packing box closed security. This mailbox is ideal for gift wrap, shipping, packing, mailing, small business, wholesale and more. Our Black Mailer Box can be folded and assembled in a few seconds. Without using tape, glue, or staples, the steps are very easy to complete and can be fixed firmly.