THREE LAYER STRUCTURE - All corrugated cardboard sheets adopt a 3 layer ultra rigid structure, which gives it excellent durability and strength. It is definitely your best choice for packaging and transportation. FLAT AND SMOOTH SURFACE - The size of the 2mm cardboard sheet is 30.5 x 30.5cm. The cardboard sheet has a flat and smooth surface, and the size is enough to be used for printing, painting, or writing. ECONOMICAL - This package contains 40 cardboard sheets, which makes it ideal for those who need a lot of cardboard. In addition, they are relatively inexpensive, making them a very economical choice. VERSATILE USE - These flat cardboard sheets are suitable for a wide range of applications, including DIY projects, crafting, and more. They can be easily cut and shaped to meet your specific needs. WORRY-FREE PURCHASE - If you have any dissatisfaction after receiving our 2mm cardboard sheets, you can give us feedback at any time.