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What is inside of a stress ball 2024?
橡胶
泡沫 压力
Questioner:William Anderson 2023-04-24 22:04:11
The most authoritative answer in 2024
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Oliver Lee——Works at the International Air Transport Association, Lives in Montreal, Canada.
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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