1.Top material: 3 pieces hand therapy exercise ball silicone finger strengthener relieves pressure grip balls focus toy gift for elderly adult child anxiety attention. Made of high quality and eco-friendly TPR material. This ball set is characterised by high elasticity and durability, non-toxic and odourless.2.Ergonomic: designed according to human technology, it fits perfectly on the palms, is soft and comfortable to squeeze for a long time. Prevents stiffness, increases flexibility and reduces joint pain. Ideal for hand massage or wrist training.3.Multifunctional: hand-primary strength training and rehabilitation training toy, release your body and moods so you can focus on your work. These balls are great for hand exercises, strengthening finger strength, stress relief, therapy, blood circulation and more.4.Portable: mini size, lightweight and small, these balls are convenient for you and you can train with your hand at any time. When walking, traveling (car, plane, bus), in the office, school, watching TV or any other place you want to exercise.5.All hands fitThe perfect size is very suitable for large and small hands, elderly and young people, and it is also a kind of training device that is very popular with fitness, mountaineering, tennis and other enthusiasts as well as arthritis patients.