Ka whakatakoto te waea whakarewa mārō he anga rere-uaua he paparanga whakarewa ōrite, ātete-ngatata, he mea hanga mai i ngā warowaiha chromium kiato-teitei, ka hanga he mata tiaki e whakanui ake ana i te roa o te whakamahinga i raro i te kaha o te pakaru.