 Mgbe e nwere unbreakable ihe ma ọ bụ ihe bụ kwa ike, ala ga-ikweta na-akpaghị aka nokpuru mmetụta nke mmiri na haịdrọlik nsogbu, nke ga-eme ka nwechapụ netiti rollers na-eme ka ike ma ọ bụ unbreakable iji zere etisa igwe. 