Vertical desktop sorter is compact for maximum desktop organization. Shelves are removable only during assembly so you can customize the compartments. Ten hardboard shelves form up to eleven 9 1/2w x 11 5/8d x 1 1/4h letter-size compartments and support up to 15 lbs. each. Made of 1/2″ compressed wood with laminate finish; solid fiberboard back.