Adjustable reading positions: adjustable angle between 0 and 68 degrees. The book holder with different notches on the movable backrest can be adjusted in height and angle as needed. Promote proper posture to improve spine health. Ergonomic design: the adjustable metal bookcase with ergonomic design can reduce pressure on the head and neck and children can effectively correct bad reading positions. Reusable. Materials: the bookcase is made of high-quality stainless steel and steel. The surface is polished and painted. It is strong, smooth, rust-proof, not easy to break and easy to clean. The bookcase looks simple and elegant and has rounded corners to protect your hands from injury or scratches. Foldable and portable: the bookcase can be quickly folded for easy storage. You can carry and store it in a backpack for outdoor activities without taking up too much space when not in use. Also suitable for home, school, office, library, dorm room, etc. Customer satisfaction is our top priority. If you have any questions about this product, please contact us immediately and we will give you a satisfactory answer.