Keep fingers, hands and forearms strong with The Restore Hand Therapy Kit . This kit will improve strength, prevents stiffness and relieve joint pain with three color-coded balls of varying resistance (soft, medium and firm). It is easy to customize to individual needs and progression and comes with a full-color exercise guide with easy-to-follow illustrations.
Prevents hand stiffness
Relieves joint pain
Strengthens hands, wrists and arms
Includes: three color-coded balls of varying resistance (soft, medium and firm) and full-colour exercise guide
Using this as a fidget toy, and I think they're helping my wrists. The difference between the soft and medium is not too noticeable. Also, the medium ball was a bit deformed (not sure if it will bounce back) and the finishing is not great.