Features: Posture Corrector: Children sitting posture corrector, protect vision and refuse to slouch. No chin support, easy fit, no binding. Durable: Made of high quality ABS material, sturdy and durable. Smooth surface, no edges and corners, safe and comfortable. Adjustable Height: The support height can be adjustable freely from 15cm to 19cm, help you find the height that suits you. Installation Free: The corrector doesn\'t need to be assembled, just fixed to the table top, suitable for most tables of different shapes and thicknesses. No Shelter: Simple modeling design, will not block the line of sight, easy to enjoy learning or reading time.