The all-new Ring-Pen Ultra is designed to support a variety of tools including pens, pencils, markers, eating utensils and small personal hygiene items like toothbrushes. It's especially beneficial for individuals with Arthritis, Carpal Tunnel Syndrome, or Repetitive Stress Syndrome, aiding those with hand weakness, fine motor skill challenges, and reducing the need to exert pressure which can prevent pain and muscle cramps. When selecting a size, the general guideline is: Large for most men's hands and larger women's hands, Medium for most women's hands and smaller men's hands, and Small for children. It is intended for right-hand use only.