This sturdy stackable bookshelf has 9 compartments with 6 adjustable shelves. Constructed from extra strong, stain resistant laminated wood composites that includes *mdf. *MDF, is a man-made fiberboard consisting of wood fibers and resin binders. It is known for its strength and stability. It is uniform in consistency and is knot free. It is structurally more stable than medium weight hardwood and it will not crack. Finishes adhere well to it, which results in a smooth end coat.