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 Heilwiy Easy Storage. You Can Carry and Store It In A Backpack For Heilwiy Outdoor Activities without Taking Up too Much Space When Not In Use. Also Suitable For Heilwiy 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.