Aluminum oxide type a Multipurpose fibre discs for use on steel, non-ferrous metals, plastics, aluminum and wood(e.G.Cleaning of construction formwork)and steel construction finishing work. Zirconia alumina grain type z Zirconia alumina grain(z)is the preferred abrasive material on alloyed and unalloyed steel sistant and stainless steels and high-temperature non-ferrous metals. Sillcon carbide type c Sillicon carbide(c)primary for use on stone but also for all other materials fields of allpication stone concrete, aluminum, plastics. Carton