Quality Material: Made with corrugated paper, which is thick sturdy cardboard, promising amazing strength and durability Box Size: BIOBROWN small shipping boxes set includes 25 boxes. The outer size of box mailers is 9.4 x 6.4 x 2.5 inches and inner size is 9 x 6 x 2 inches Personalized Boxes: The natural color box can bring you unlimited creativity. Decorate the box with beautiful flowers, cute ink stamps or personalized stickers for a chic look Convenient Assembly and Storage: Corrugated boxes are very easy to assemble without any tapes or glue. Packed flat to you makes storage more convenient, saving space when it is not needed Multipurpose: The cardboard shipping boxes work great for shipping small and lightweight fragile items, such as books, CDs, small soaps, small glass bottles, mugs and any other fragile items