Ko te whitiki PET ( polyester ) te mea pai rawa atu i te wa e whiriwhiri ana i te here pai mo te miro bale tuku tawhiti. Ko enei taonga whakangao pai-taiao he nui te kaha o te kaha (180-1360 kg te kaha pakaru), he nui te parenga wera, me te pumau o te UV, he mea tika katoa mo te tuku cotto