A fabulous gift for any budding scientist. Horrible science is fact filled and humorously illustrated. Contains 20 paper-backed books in a presentation box. Ages 8 to 12. Flaws: top of the box is missing Base of the box- is tapped on one end Books- are in fantastic condition except for 2. I’ve had the top corner bent, and one has a couple of small dots on the edge of the book. There is a slight discoloration on the top of several of the books. Some of the books do not look like they have been , or read. Great find to add to your home library