Ko te mahinga o te miihini whakakii ko te nuinga o te ahua o te puawai concave convex me te ahua whakaheke me te rereke rereke o te waa.Ko te papanga i muri i te whakamahana wera ka tino whakanui ake i te elasticity me te ahua-toru, me te ahua o te ahua whakaheke he tino huatau me te huatau.Kei te whakamahia nuitia te miihini whakakikorua i roto i te umanga kakano, ka taea te whakamahi ki te hanga i te koti tangata pai, te remu, te tauera whakairi whakapaipai, te kakahu uhi, me era atu.