This product is made of 30-layer PE film coated with adhesive, while the bottom left of each sheet the labeled # 1-30 for easy replacement. When using, please first tear down the covering layer of the adhesive surface from the back opening; then please place it on a flat, clean, and waterless floor. Moreover, please use the soles to even out the edges of the floor adhesive and tear down the covering layer from the front opening. In this way, you can use it. During the process of use, if the surface is begrimed full of dust, please tear off this layer and use another clean layer.