... cargo trolley, turntable roller skids, crawler type roller skate, steerable machine skate, veered moving roller skids, geared roller skids, and so on ... , it have follow kinds: PU wheels cargo trolley, nylon wheels roller skate, steel wheels machine skate. PU wheels cargo trolley ... floor, or it will hurt your cement floor. Nylon wheels roller skate the performance between the PU wheels cargo and ...