Heavy-duty, metal construction with a removable MDF top tray. Center two baskets are adjustable in height. Can be configured with four bins as a standing laptop station, three bins for deskside storage, or two bins for underdesk use. Rolls smoothly on four casters, two locking. Color: Gray; Capacity (Weight): 50 lbs.; Caster/Glide/Wheel: Four Casters (2 Locking); Material(s): MDF; Metal.