Section 15 Base metals and articles of base metal 81 Other base metals; cermets; articles thereof 81 05 Cobalt mattes and other products of cobalt metallurgy; cobalt... 81 05 20 Cobalt mattes and other intermadiate products of cobalt metallurgy; unwrought cobalt;... 81 05 20 00 Cobalt mattes and other intermadiate products of cobalt metallurgy; unwrought cobalt;... Commodity Code Description 81 05 20 00 000 Cobalt mattes and other intermadiate products of cobalt metallurgy; unwrought cobalt;...