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. Another type uses a thin rubber membrane surrounding a fine powder.
Stress balls are an excellent way to relieve stress anywhere you are, at any time. Their portability allow you to take them with you to work or school or even out .
Mini Neon Smile Face Stress Balls. Monster Character Stress Balls. .. They appear to be made from a powder or flour kind of material on the inside and a .