Description: Firmly fasten the book or documents prevent tilt and page by wind Help students keep best visual angle and correct the unhealthy posture also benificial for fatigue of eyes and body Adjustable foldable convenient to use Suitable for Book Stand Holder Tablet Bracket etc Material: Size Chart: Approx. 210x165x23mm/8.27x6.50x0.91inch Package Includes: 2x Note: Due to the difference between different monitors the picture may not reflect the actual color of the item. Due to manual measurement there may -2mm error in size.