Hand Exercise Balls - Egg Shaped - 3 Squeeze Resistances (Soft, Medium, Firm) - For Hand Training, Physical Therapy, Injury Rehabilitation This set of Hand Exercise Eggs have a comfortable, textured surface and 3 different squeeze resistances (soft, medium, firm). Perfect for hand training, physical therapy, injury rehabilitation, etc. Can be squeezed, rolled or catched to offer a wide range of muscular and motoric/reflex workouts. A perfect solution to strengthen your fingers, palms and forearms. Other applications include: arthritis relief, stress relief, reducing repetitive strain injuries caused by texting and typing, improving your musical instrument skills, etc. The Hand Exercise Eggs are made of a thermoplastic rubber, but do not have a strong rubbery odor and are washable in plain water. As with all exercise and therapy equipment, individual results may vary. But any kind of resistance training in cases of injury, will help rebuild muscle tone and strength.