Flame felt bobs are made of 100% wool felt, mounted on 3/32″, 1/8″ shanks. These felt bobs are ideal for use on die grinders, electric drills and air drills. The maximum operating speed is 15000rpm. They 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.