Cabinet is formed from compressed wood with laminate finish and a solid fiberboard back for strength and rigidity. Strong hardboard shelves form letter size compartments that adjust to increase the size of individual compartments for storage of books, 3-ring binders, etc. Model 9422 includes a plastic rod adapter to store and organize CD's in the bottom two compartments. Black plastic molding complements finish while doubling a a labeling area. 39 1/4" wide units can be stacked up to three or up to 72 compartments. Combine units with and without drawers for ultimate flexibility. 16 compartment unit is 19 1/2" x 11 3/4" x 21". 24 compartment unit is 39 1/4" x 11 3/4" x 16 1/4". 36 compartment unit is 39 1/4" x 11 3/4" x 24". 32 Compartment unit is 39 1/4"W x 11 3/4"D x 25 1/4"H and features two drawers.