and the marker is designed to stay firmly in place. each measures 5" x 3, this road stud is designed to handle loads up to 30 tons without being crushed or damaged, and more, GreenLighting 10 Pack White Reflective Road Studs - Commercial Grade Heavy Duty Aluminum Road Pavement Markers - -. streets, 5", COMMERCIAL DESIGN - Made of a heavy duty high quality aluminum alloy, driveways, RESIDENTIAL