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[[File:Turkey stress reliever.jpg|thumb|A turkey-shaped foam rubber stress reliever]]
[[File:Turkey stress reliever.jpg|thumb|A turkey-shaped foam rubber stress reliever]]


A '''stress
A '''stress ball''' is a malleable toy, usually not more than 7 cm in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to either help relieve stress and muscle tension or to exercise the muscles of the 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.<ref>{{cite web|url=http://www.stressballs.gb.com/info/stressfaq.html|title=Stress Ball FAQs|archiveurl=http://web.archive.org/web/20080215101551/http://www.stressballs.gb.com/info/stressfaq.html|archivedate=Feb. 15, 2008}}</ref>

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. The latter type can be made at home by filling a balloon with [[baking soda]]. Some balls similar to a [[footbag]] are marketed and used as stress balls.

Despite the name, many stress balls are not spherical. Many stress toys are molded in amusing shapes and screen or transfer printed with corporate logos. They are presented to employees and clients as promotional gifts. Stress balls are the third most popular promotional gift in the UK.{{fact}} Stress toys are a staple of [[cubicle]]s where [[repetitive stress injury|repetitive stress injuries]] such as [[carpal tunnel syndrome]] are common. Because of the many shapes now available, stress balls are generically known as stress relievers.{{Citation needed|date=August 2007}}

== References ==
{{reflist}}

{{Commonscat|Stress balls}}

{{DEFAULTSORT:Stress Ball}}
[[Category:Ergonomics]]
[[Category:Physical therapy]]
[[Category:Stress]]
[[Category:Balls]]
[[ar:كرة ضد التوتر]]
[[fr:Balle anti-stress]]
[[it:Palla anti-stress]]
[[ml:സ്ട്രെസ്സ് ബാൾ]]
[[nl:Stressbal]]

Revision as of 18:19, 26 October 2010

A stress ball in use
A turkey-shaped foam rubber stress reliever

A stress