This is a complete set of 12 volumes of Benesse's Challenge 4th Grade optional science curriculum, "Kagaku-gumi." There are no noticeable stains or tears. Please check the third photo for a slight crease on the cover of the October issue. Recommended for children who love science. Please understand that these are used children's items before purchasing. The original price for the complete set was 13,080 yen. ★Description These textbooks are designed to expand children's interests and develop their ability to discover problems, create knowledge, and solve problems, in accordance with their development. Features include: Approximately 60 pages, all in color Well-balanced coverage of four fields: "Nature," "Society," "Culture," and "Science and Technology" An intellectually stimulating book that allows children to enjoy experiments using everyday items.