Plastic drainage boards are made by pressing plastic base plates made of polystyrene (HIPS) or polyethylene (HDPE) into conical ridges or reinforced ribs (or hollow cylindrical porous shapes). Through continuous innovation and R&D, the raw materials have seen significant improvements and transformations. Currently, they are manufactured from () material, resulting in greatly enhanced compressive strength and overall flatness. The widths range from 1 to 3 meters, and the lengths are 4 to 10 meters or more.