Fiber is a kind of polishing material, also known as fiber polishing wheel, nylon fiber, polypropylene fiber, cutting force is strong, can be partly replacing traditional cloth wheel, wheel and rubber sponge cloth emery cloth wheel, covering cloth belt left by the thick line, larger burrs of fine except for casting and even after the excellent effect on repairing and grinding grain fine and beautiful. Can be used for manual and automatic grinding, middle or rear line treatment and to eliminate less visible surface imperfections.