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 needed. Promote correct posture to improve spinal health. Ergonomic design: The ergonomically designed adjustable metal bookcase can reduce the pressure on the head and neck, and children can effectively correct bad reading postures. High-quality materials: The bookcase is made of high-quality stainless steel and steel. The surface is polished and varnished. It is strong, smooth, rustproof, not easy to break and easy to clean. The bookcase is simple and elegant and has rounded corners to protect your hands from getting hurt 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, dorm, etc.