Four 13-in cubes in a 27.5-in square frame make this the compact member of the cube-shelf family - it fits a hallway or the end of a bed where a six-cube unit would not. A guardrail across the back of the bottom shelf stops books sliding through the open back. The top surface holds 100 lbs, each cube 22 lbs, and the bottom shelf is 12 in deep. The unit weighs 30 lbs in coffee-toned engineered wood. A user manual is included and assembly is required before use.