Hand trainer ball with different hardnessThe hand finger trainer has 2 different degrees of hardness and design. The blue ball is for soft resistance (4.5 kg), the yellow ball is for medium resistance (11 kg). If you want to improve finger mobility or restore finger and forearm function due to disease, you can use our hand trainer. Finger Training Ball Washable HandHand practice balls are washable and can be cleaned with water as usual after use. With the washer, this stress ball fits your hand perfectly. The surface of the finger trainer is slightly rough and prevents it from slipping. Durable and sturdy - anti-stress balls stressThe ball hand trainers are made of high quality PUelastic silicone and retain their shape even with frequent use. Our hand exercise balls are specially designed for frequent and long-term use. Safe, ecological and in any case durable. Rehabilitation and prevention And this training kit is perfect for improving finger and hand strength for athletes such as climbers, fitness, tennis, baseball, boxing, tennis, golf and shooting, and musicians such as guitarists, bassists, pianists, violinists, etc. Ergonomic design for all hands The strength trainer is ergonomically shaped and fits hands of all sizes and ages well, ideal for men, women, seniors and teenagers. Mini in size, lightweight and small, these balls are comfortable for you and you can still practice in your hand, they are portable and lightweight in any pocket or pocket.