There is uncertainty about this as there is little reliable information about these times. Based on what we do know and archeology, they were very similarly equipped to Greek hoplites. Spears and shield, swords and armor if they could afford it. At some point they fought in phalanx formations as well. Material was mostly bronze, later iron. The Roman Army as we know it with its maniple system was only adopted hundreds of years later. Source : The Complete Roman Army - Adrian Goldsworthy