Tikugwirizana ndi: 1.Sand inching (imvi inoron, iron chitsulo, aluminiyamu, etc steel, chitsulo chosapanga dzimbiri, ndi zina zambiri.) 3. Amapha : Ulimi, zamadzi; Zomanga, makina, azachipatala; Makina azakudya, ma valves ndi zina zotero. Zinthu zomwe tidagwiritsa ntchito aluminium; Mkuwa; Mkuwa; Mkuwa; chitsulo cha kaboni; chitsulo chosapanga dzimbiri ndi chonchi nthawi yomweyo, titha kupereka machipatala; Phula; Kusintha kwamphamvu; yotentha kuyika ganyu: ufa wokutira: kupaka utoto: Kusunga, msonkhano, msonkhano. Zinthu 85% zimagulitsidwa kunyanja, makasitomala ndi ochokera ku America, Canada, Europe Union, etc.