High Quality Content by WIKIPEDIA articles! A stress ball is a malleable toy, usually not more than 7 cm in diameter filled with a soft material used for stress and muscle tension in your hand. There are many types of stress balls. Many are a closed-cell polyurethane foam rubber. This type of stress ball is made by injecting the liquid components of the foam into a mold. The resulting chemical reaction creates carbon dioxide bubbles as a byproduct, which in turn creates the foam Stress balls, especially those used in physical therapy, can also contain gel of different densities inside a rubber or cloth skin.

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