Iceberg Rough N Ready 4 shelf open storage system. Perfect for storing office supplies, files, books and binders. Constructed of durable injection molded polypropylene. Heavy duty uprights for increased stability. Won"t scratch or dent. Easy snap together assembly. Each shelf holds 75 pounds evenly distributed. Shelves, uprights, and trim caps included. For lighter duty applications. Snap together assembly in 5 minutes.