Stainless steel sideplates, two stainless sheaves, ball bearings, and stainless steel axle. ?Max Speed = 130 ft/sec or 90 MPH. !WARNING: The handles on the Rapid Transit Trolley 5/8 are for orientation purposes only. They are not designed for life support usage! DO NOT HANG ON HANDLES! Riders weight must be supported by a lanyard and supporting harness.