Ena ke mokotlana oa oache oa aluminium o bolokang lioache tsa banna le tsa basali, tse nang le bokahare bo bonolo le mosamo ho sireletsa oache ea hau.Ho bonolo ho jara le ho tsamaisa.
Re feme e nang le boiphihlelo ba lilemo tse 15, e ikhethang ka tlhahiso ea lihlahisoa tse ikhethileng joalo ka mekotla ea litlolo, linyeoe tsa litlolo, linyeoe tsa aluminium, linyeoe tsa sefofane, joalo-joalo.