Ball shaped felt bobs: Made of 100% wool felt, mounted on 1/8″ or 1/4″ shanks. 4 hardness are available which include soft, medium, hard and rock hard. Ball shaped 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 finishing surface. Ideal for polishing jade, ring, stones, plastics, glass, crystal, ceramics, steel, wood, moulds and medical equipment. Other kinds of felt bobs are available.
