Noodle-shaped felt bobs are made of 100% wool felt, mounted on 3/32″, 1/8″ shanks. These bobs are ideal for use on die grinders, electric drills and air drills. The maximum operating speed is 15000rpm. These noodle-shaped felt bobs can be used with various polishing compounds or rouges to produce a clean, high finish on moulds, dies, models, all metals, plastics, glass or crystal. Great for polishing and buffing all hard to reach surfaces.