Plastic drainage boards are made by pressing a plastic base material, either High Impact Polystyrene (HIPS) or High Density Polyethylene (HDPE), into conical bosses or reinforced ribs (or hollow cylindrical porous shapes). Through continuous innovation and research, the raw materials have undergone significant improvements and transformations. Now, they are produced using () as the raw material, resulting in 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.