A na-eji njikọ magnetik arụ ọrụ n'ime nfuli draịva magnetik na-enweghị akara, nke na-adịghị emebi emebi, nke a na-eji eme ihe na-agbanwe agbanwe, na-ere ọkụ, corrosive, abrasive, na-egbu egbu ma ọ bụ na-esi ísì ọjọọ. A na-etinye mgbanaka magnetị n'ime na nke mpụta na ihe ndọta na-adịgide adịgide, nke ejiri hermetically mechie site na mmiri mmiri, na nhazi ọtụtụ.