[Features] Premium MaterialsOur hand exercise ball is made of high-density TPR, which is highly elastic, non-toxic,healthy and environmentally friendly, very non-slip, and feels comfortable when you perform hand exercises,and can be used by children and adults. Ergonomics DesignThe shape of the hand exercise ball is oval, which can train five fingers at the same time. The spherical shape fits the entire palm and helps to distract the palm during training. After a long time of training, the palms of my hands are not so tired. Enhance Blood CirculationThis hand exercise ball has spikes on the surface, which can promote blood circulation. High tentacles, moderate hardness, durable and non-wearing, capable of depth Of stimulating acupuncture points. Two ModelsOur hand exercise ball includes four-finger and two-fingers, and two colors are available to provide basic grip training for rehabilitation hands. You can freely choose which model to use to exercise often overlooked muscles. Exercise Easily And AnywhereHand exercise ball is lightweight and you can bring them wherever you want in your bags, suitable for many occasions, such as school, home, office and so on. [product information] product name: grip strength ball color: yellow Material: TPR size:Length: 5.8cm, Width: 4.2cm Packing list (you can get after purchasing one item): grip strength ball x 1 Please understand: 1. Due to the long shipping time, the item may be damaged during the shipping process, if the item is damaged, please leave us a message through the official website immediately before posting comments, and I will solve the problem for you. 2. Due to manual measurement, the size may have an error of 1-3cm. 3. Colors may vary from monitor to monitor.