CanDo Digi-Extend n' Squeeze Hand Exerciser combines best features of Digi-Extend and Digi-Squeeze. It helps to develop isolated finger strength, flexibility and coordination. Provides complete reciprocal exercise program (flexion and extension). Ergonomic ball-shape positions fingers and hand for ideal pressure distribution. Each exercise comes with exercise pamphlet. CanDo Digi-Extend n' Squeeze available in 3 sizes. Each size available in 5 color-coded resistance levels for flexion. Each unit is packaged standard with latex free extension bands covering 4 color-coded levels from the lightest to heaviest extension requirements.