Heavy-duty, slide tube silver vein steel frame. Dual axle provides easy transition of seat height to hemi-level. 8" x 2" semi-pneumatic casters are adjustable in 3 positions. Easy push-to-lock wheel locks. Removable desk length arms with padded armrests. Heavy duty vinyl padded upholstery with chart pocket. Tool-free footrests include heel loops and aluminum footplates.