Ọdabara na metal metal, non-ferrous metal, IC mpempe akwụkwọ, mkpuchi, lamellar metal;Glass, seramiiki, agate, bara nnukwu uru, mpempe akwụkwọ plastik, wdg;Nnwale ike siri ike, dị ka nnwale nke omimi na gradient nke carbonization na akwa akwa siri ike.