Versatility and durability come together in this efficient organizer. Cabinet is 5/8" compressed wood with laminate finish. Shelves form 9"w x 11 1/2"d x 2 1/4"h 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 stackable units. 39 1/4" units stack up to three high or 72 compartments. Solid fiberboard back.