6 adjustable reading positions: Length: 21.1 cm, width: 16 cm. The book holder with different notches on the movable backrest can be adjusted in height and angle as required. Promote proper posture to improve spine health.Ergonomic design: The adjustable metal bookcase with ergonomic design can relieve pressure on the head and neck, and children can correct poor reading positions effectively (reusable).High-quality materials: The bookcase is made of high quality stainless steel and steel. The surface is polished and varnished. It's 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 being injured or scratched.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, dormitory, etc.High quality after-sales service: 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.