Hollow hollow board is a special three-layer structure, with a ratio of iron and other solid plate better impact properties. Because wood has water absorption, moisture absorption characteristics to increase their own weight, over time will be deformed, moldy, so the product can be achieved with plastic and wood, plastic and steel with good results, and its superior environmental performance more is increasingly being recognized, disposal simple, reusable, can also be made of other plastic products, widely used in electronics, hardware, advertising, logistics and other industries.