Excellent value. Notice this is 15 inch deep shelves. Very heavy - the 72" by 36" weighed 100 pounds. Backing is fiber board but interior shows as matching finished wood. Instructions could use a step indicating it needs to be flipped prior to assembling the back. Pay close attention to the pictures. Also take care to have the backing exactly square and showing 1/8 inch clearance all around before nailing down. Seemed impossible at first but aligning served to make sure the bookcase was exactly square. This is not solid wood but such high quality manufactured wood - it is truly beautiful. Got the natural cherry and it truly looks exactly like my real natural cherry desk (Not the fake red cherry you see so often). Will definitely buy this manufacturer again.