The Foba ROBRI Double Rail Trolley with Long Brackets are designed for the Mega-Track System . Foba Mega-Track trolleys and rollers are designed for the heaviest loads. Built with high-precision ball-bearings, they glide smoothly and almost silently. This enables efficient studio work without fatigue. For even more convenient working, above all with large bank lights and heavy lamps in photography and film studios, optional remote-controlled motorized trolleys can be used with this ceiling rail system. The MegaTrack System is best suited for equipment that is not moved often.