Some stress relievers are made from closed-cell polyurethane foam rubber.. 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.
There are commercial stress balls that are not filled, rather they are made out of a special pliable foam rubber called closed-cell polyurethane foam rubber. The manufacturer injects a special liquid into a mold, resulting in a chemical reaction that creates carbon dioxide bubbles.
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