The Hand Exercise Rainbow Flex Gel Eggsercizer® is ergonomically shaped and made to fit the contours of the hand. It is designed to provide effective resistive therapy in a wide variety of exercises for the fingers, hand, wrist, and forearm. With regular use, persons can improve grip strength, increase dexterity and mobility, develop motor skills, and improve their circulation. Can be heated to provide additional release for arthritic and injured hands. Latex free