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Cardboard is a material made of a fluted corrugated sheet and one or two sheets of flat linerboards. Cardboard was invented more than a hundred years ago. It is a low-cost, strong and light-weight material that is easy to process. Also, it is an environment-friendly material as over 80% of cardboard sheets can be recycled. Cardboard is widely used in laser engraving and DIY projects, and STEAM education workshops.