Spiky Hand Squeeze Stress Ball can also improve hand strength, finger dexterity, and joint flexibility. Stress Ball is not only a treatment for anxiety, but also an effective physical therapy tool for pain relief. Spiky Hand Squeeze Stress Ball is mainly made of safe, soft, flexible and durable material for a long time use. It is an ideal choice for injury prevention and recovery, has effective treatment of carpal tunnel syndrome, arthritis, tendinitis. Stress Relief Ball with spiky design is easy to clean and can be repeatedly compressed without deforming. The spiky massage balls are very easy to clean and are superb comfort and effectiveness. You can take them everywhere with you for a treatment for anxiety whenever and wherever you need.