Heavy-duty steel. Comes with a double platform with non-slip rubber tread. Spring-loaded casters retract under slight pressure, forcing base to the floor. 11" diameter upper platform and 13 1/2" diameter lower platform. 17 1/4" diameter base has an all-around protective bumper. Blow molded polyethylene top. Lightweight with folding legs for easy storage. 29" fixed table height with locking steel legs. Easy to clean. Folding legs automatically lock by use of gravity activated mechanism when opened. Rectangular. Black.