This product is made of high level masking paper, and is used together with PE handle. It is specially used in dust clean of manufacturing procedures such as semi-conductor, PCB and so forth. Especially for inner cleaning of the oven in the manufacturing procedure of PCB, it has outstanding result, and as for the cloth hard to clean, it is also applicable. This product is specially designed with saw-tooth release mouth so that it can be used easily and conveniently.