Plastic drainage boards are made by molding plastic substrates made of polystyrene (HIPS) or polyethylene (HDPE) into conical bosses or reinforced ribs (or hollow cylindrical porous) through stamping. Through continuous innovation and research, the raw materials have experienced significant improvement and transformation. Now, they are manufactured from (), offering greatly enhanced compressive strength and overall flatness. The width ranges from 1 to 3 meters, and the length is 4 to 10 meters or more.