Size of Product: The 3 mm-thick corrugated cardboard sheets feature 30 × 20 cm dimensions, approximately A4 size, and can be cut to individual requirements for a more personalised fit. (20 × Corrugated Cardboard） Layered Design: The thick cardboard A4 is made of two layers of kraft pads, with a middle layer of corrugated board as support. It has many uses in the packaging industry and is also widely used in artwork and crafts. Easy to Use: The kraft pads are easy to fold, cut and paint, so you can use the simplest materials to make items that make you satisfied. They add fun to DIY crafts and can also be used as a protective packaging for transport, acting as a cushion. Environmentally Friendly: This thick cardboard is made of renewable raw materials and reusable, it protects the goods for transport, which is a ideal product for both product protection and environmental protection. Wide Range of Uses: This brown cardboard is suitable for a variety of scenarios, in addition to transport protection, it is also suitable for children's handicrafts, tray dividers, making photo frames and so on.