6 adjustable reading positions: Length: 21.1 cm, width: 16 cm. The book stand with different notches on the movable backrest can be adjusted in height and angle as needed. Promote correct posture to improve spinal health. Ergonomic design: The adjustable metal bookshelf with ergonomic design can relieve pressure on the head and neck, and children can effectively correct bad reading postures (reusable). High-quality materials: The bookshelf is made of high-quality stainless steel and steel. The surface is polished and lacquered. It is strong, smooth, rust-proof, not easy to break, and easy to clean. The bookshelf looks simple and elegant and has rounded corners to protect your hands from injury or scratches. Foldable and portable: The bookshelf 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 customer 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.