Plastic drainage boards are made by stamping plastic substrates, which are either made of 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 produced from (). This has greatly enhanced the compressive strength and overall flatness. The width ranges from 1 to 3 meters, and the length is 4 to 10 meters or more.