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High-Quality Materials：The stress balls are made of thermoplastic rubber (TPR) with an ergonomic design and unique textured surface, easy to clean. Our stressball can be repeatedly compressed without losing its shape.
Tear-Resistant：The hand strengthener is highly tear-resistant and will not break open.Hand exerciser may become dirty after playing for a long time, at this time, you only need to rinse with warm water and detergent. After it dries naturally, wipe with talcum powder just like new.
Relieve Stress：The stress balls for kids can strengthen and improve flexibility in the hands, fingers, wrists and forearms, ease joint pain, help with stiffness of the the fingers. The physio balls can alleviate repetitive strain injury from texting, typing ,gaming and playing musical instruments.