Isu tinopa huwandu hwakawanda hwesimbi yesimbi yesimbi yekupfeka zvikamu zvinopa yakasimba yunifomu simba mumativi ese. Isu tinokanda ductile iron, ADI, CADI, Ni-Resist, Ni-Hard, uye compacted graphite, zvakare grey iron uye nezvimwe zvakawanda simbi.