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Reference.org
Stress ball
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<p>A stress ball or hand exercise ball is a malleable toy, usually not more than 7 centimetres (2.8 in) in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to relieve <a href="/facts/Stress_(psychological)/eqat8pq9">stress</a> and muscle tension or to exercise the muscles of the hand. </p><p>Despite the name, many stress balls are not spherical. Some are molded in amusing shapes, and pad- or transfer-printed with corporate logos. They may be presented to employees and clients of companies as <a href="/facts/Promotional_gifts/cxFFXXq4">promotional gifts</a>. Because of the many non-spherical shapes now available, stress balls are generically known as stress toys or stress relievers. </p>