MATERIAL - The cardboard is made of corrugated cardboard material, which has strong toughness, wide applications, and can be stacked and placed. THREE LAYER STRUCTURE - All corrugated cardboard sheets adopt a 3 layer ultra rigid structure, which gives it good strength. It is practical choice for packaging and transportation. SIZE - Each cardboard pad has a size of 30 x 20cm, with a thickness of 3mm. The surface of the cardboard sheet is flat and smooth, and the size is sufficient to meet your crafting, or packaging needs. 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. PACKAGING CONTAIN - This package contains 60 pieces cardboard sheets, suitable for those who require a large amount of cardboard.