3 pieces hand trainer ball: Finger trainer Hand trainer has 3 different degrees of hardness. The yellow ball is for soft resistance, the red ball is for medium resistance, and the blue ball is for hard resistance. If you want to improve your finger mobility or restore the function of your fingers and forearms due to an illness, you can use our hand trainer set. Washable hand training ball The hand trainer balls are washable and can be cleaned with water as usual after use. With its oval egg shape, this anti-stress hand ball adapts perfectly to your hand. The surface of the finger trainer is slightly roughened and prevents it from slipping away. Durable and robust Anti stress balls: The ball hand training devices are made of high-quality thermoplastic rubber and keep their shape even with frequent use. Our hand exercise balls are extremely durable and sturdy, do your exercises, you can use them anytime, anywhere. Anti-stress balls for strengthening-reha ball hand: The anti-stress balls support you in addition to training your resilience and the development of dexterity in order to reduce stress. The hand training device is suitable for a wide variety of people and is particularly suitable for sports and activities such as climbing, bodybuilding, fitness, tennis, baseball, boxing, golf, etc. Product s Egg-shaped grip balls have 3 different degrees of hardness. The anti stress balls are washable and can be cleaned with water as usual after use. Our hand exercise balls are extremely durable and sturdy, carry out your exercises, you can use it anytime anywhere. Ball hand training equipment is an ideal training set to improve the overall grip strength and the flexibility of the fingers. Antistress ball made of 100% high quality thermoplastic rubber, the stress ball is hypoallergenic, non-toxic. Package 1 * Yellow Ball 1 * Red Ball 1 * Blue Ball