White paint on a pair of matching towers gives more layout options than one wide bookcase: side by side they read as a single block, apart they bracket a bed or a doorway. Each unit has two shelves adjusting in 2.3-in steps within a 15.5 x 11 in bay, with 55 lbs on the top and 66 lbs across the shelves. Each measures 16.5 x 11.5 x 31.5 in and the pair weighs 20 lbs, arriving in two cartons with one user guide. Engineered wood and MDF; assembly is required before use.