This term is aimed to relieve joint pain, stress, muscle tension from computer work, basketball-playing, badminton-playing, and so on. With its small volume and ultra-light weight, you can massage you hand by squeezing, rolling, and pressing this ball anytime, anywhere.Features:1. This term adopts high quality elastic material and textured surface, and gives a fantastic and comfortable touch feeling.2. Perfect for training flexibility of fingers against stiffness and doing rehabilitation training, exercising hand muscle and enhancing hand strength.3. Squeeze, roll or press the ball to relieve tension and reduce stress.4. Due to its Small volume and light weight, it is easy for carrying and you can relax your hand anytime, anywhere.5. Suitable for those people, who are rock-climbers, body-builders, computer-workers, badminton and ping-pong lovers, etc.6. This product has five different colors for you to choose, and their hardness are slightly different from each other, specifically, they become harder in this color order: Yellow, Orange, Red, Blue, Green.Specification:Condition: 100% New and High QualityColor Hardness Coefficient Material: SiliconeYellow15 Color Option: Yellow, Orange, Red, Blue, GreenOrange20 Dimension(WxH): Approx. 44x58mm/1.73x2.28inch(Egg Shape) Red25 Applicable People: Free Blue30 Weight: Approx. 55gGreen35 Packing List:1 x Egg Shaped Grip Ball