Zinthu zomwe zidaphwanyidwa ndi chida ichi zimakhala ndi mayunifolomu ndipo zimakhala zotayikira, ndipo zimatha kuyikidwa mwachindunji mu chosumikizira chopukutira kapena chowumitsira mpweya kuti chiume. Mphamvu yowuma ndiyabwino ndipo nthunzi imapulumutsidwa. Nthawi yomweyo, zida zimakhala ndi mapangidwe osavuta osinthika komanso yosavuta kukonza, ndipo ndi zida zabwino zopulumutsa mphamvu.