These colourful writing grips are ideal to help anyone who has trouble gripping a pen, such as arthritics. They are also helpful for people who write a lot and get writer's cramp. The grip just slides over a pencil or pen. They are made of soft, smooth vinyl so they are both comfortable and easy to keep clean. Their triangular shape prevents them from rolling away. 2" (5 cm) long by 0.75" (2 cm) across.