The Eggsercizer Hand Exerciser is a gel squeeze ball hand exerciser that is ergonomically shaped to fit the contours of the hand. With regular use, this egg shaped hand exercise aid helps to improve grip strength, increases dexterity and mobility, encourages motor skills, and improves circulation. The Eggsercizer Hand Exercisers gel squeeze balls can be used for grip strength, dexterity, mobility, and fine and gross motor skills. Latex-free gel eggs are designed to feel great in the hand and provide effective resistance therapy in a wide variety of exercises for the fingers, hand, wrist, and forearm. The four color-coded densities allow the gel squeeze balls to be used for most stages of hand, wrist and finger rehabilitation. Eggsercizers are made of a non-allergenic polymer that will not crack, leak or melt and can be heated to provide additional release for arthritic and injured hands. Heating the gel squeeze balls in a container of warm water for 3 to 4 minutes prior to activities can improve peripheral circulation in the hand and fingers. Chilling them in the refrigerator can reduce hand swelling and desensitize painful areas. The Eggsercizer Hand Exercisers are available in 4 different colors and resistance levels: Orange Eggsercizer is Extra-Soft Green Eggsercizer is Soft Blue Eggsercizer is Medium Plum Eggsercizer is Firm Eggsercizer Hand Exerciser Specifications: Material: Latex free, washable, synthetic rubber material. Choose: Extra-Soft Orange, Soft Green, Medium Blue or Firm Plum. Includes: Handbook with ideas for rehabilitation and strengthening.