Eight cubes in three sizes sort a desk by what actually lives on it: 13 x 9 x 11.5 in bays for reference books, 9 x 8.5 x 5.5 in ones for stationery boxes and an 11 x 9 x 6 in top shelf for display. Capacities are matched to size at 44 lbs on top, 22 lbs per large cube and 11 lbs per small one, 132 lbs across the unit. It measures 23.5 x 9 x 31.5 in and weighs 23 lbs - narrow enough to stand at one end of a desk rather than spanning it. White engineered wood and MDF; a user manual is included.