My daughter used this when she was in the lower grades of elementary school. She would place it on the table like a decoration and hold it when doing homework. Would you like to try it? Some of the content has been uploaded from the Kumamoto Koma website, so please refer to it. The size is "Large". Height: Approximately 81mm Diameter: Approximately 84mm Good Pos [Just grip it, improve posture] [Improve hunchback and lower back pain] Recommended for children in the 1st and 2nd grades of elementary school who are just starting to learn to read and write. Improving writing posture can lead to increased concentration in learning, relief of stiff shoulders, prevention and improvement of hunchback, and prevention of vision decline. It can be used not only by children but also by high school and college students studying for exams, and adults who want to improve poor posture, stiff shoulders, headaches, and lower back pain from telework and remote work.