· He pai te whakamahana
Ka whakamahia e te kohu kohu kohu te mamaoa me tetahi pehanga hei puna wera (ka taea hoki te whakamahi whakamahana hiko). Ko te kohu koti he ahuatanga o te waahi whakamahana nui, te pai o te waiariki, te whakamahana rite, te wa poto o te kohua wai, me te ngawari ki te whakahaere i te pāmahana whakawera.
·Haumaru me te watea
Ko te tinana o roto o te kohua (pota o roto) o te kohua koti he mea hanga ki te kowiri tira austenitic-waikawa me te wera-aukati, he taputapu me te pehanga me te paera haumaru, he ataahua te ahua, he ngawari ki te whakauru, he pai ki te whakahaere, haumaru me te pono.