Cabinet is 5/8" compressed wood with laminate finish. 11-3/4" deep. Shelves form 9w x 11-1/2d x 2-1/4h letter size compartments, adjustable in 2-1/2" increments. Black plastic molding complements finish and doubles as a convenient labeling area (labels included). Each hardboard shelf holds up to 15 lbs. Mix and match drawer units with drawerless units. Solid fiberboard back. Quick and easy assembly.