Raised guardrails along the top shelf stop paperbacks toppling off the back when the unit is set in the middle of a desk rather than against a wall. Three shelves each 15.5 in wide with 4 in between them suit paperbacks, stationery and small storage boxes; the top is 4.5 in deep and the two below 6 in. The whole thing measures 16.5 x 6 x 14 in and weighs 5.5 lbs with a 33-lb capacity - small enough to lift onto a shelf or move between desks. White engineered wood; an instruction sheet is included.