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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.
Also know, are squishy balls toxic?
Take a deep breath and relax- all you need to do is to take your squishy ball out of your pocket. SAFE, NON -TOXIC – These non-sticky squishable stress balls are non-toxic and odor free, making them safe for children; they won't leave behind stains or greasy hands.
Similarly, is the stuff inside a stress ball toxic?
Although gel stress balls don't rupture easily, it is possible to break one under heavy pressure or repeated use over time. While many manufacturers claim their balls are non-toxic, the contents can stain clothing and may be harmful if ingested.
Toxic Squishies All 12 Squishies were found to emit toxic substances (including dimethylformamide, xylene, and methylene chloride). The chemicals are thought to cause reproductive problems, cancer, liver and nervous system damage, and irritation to the mucous membrane and eyes.