Na-ewebata ngwaahịa ọhụrụ anyị, nnukwu aka na-adọkpụ, nke sitere na ihe zinc alloy kacha mma, nnukwu aka a na-adọkpụ bụ nkọwa nke okomoko na ịma mma.Emeziri nnukwu aka ndọpụta iji kwalite uru ọnụ ụzọ gị dị mma site na imeju ihe ndozi ụlọ gị nke ọma.