Post Insulator yapadera yamadera owonongeka moyipa, kuthamanga kwamakina othamanga, kutalika kwa nthawi yayitali ndi mzere wamagetsi wamagetsi. Ndipo khalani ndi kulemera kocheperako, voliyumu yaying'ono, yosasweka, anti-bend, mphamvu yayikulu yoteteza-kupindika komanso chitetezo champhamvu cha kuphulika.