Tibetan Buddhists believe that saying "Om mani padame hum" mantra, out loud or silently to oneself, invokes the powerful benevolent attention and blessings of Chenrezig Avalokiteshwor, the embodiment of compassion. (Click Link on Avlokiteshwor to Read about Him and click back Button to come back to this page again)
Hand held wheels, the most common type, are made to be spin with one hand. They are generally made of a round body of metal (sometimes of wood), penetrated along its axis by a metal axle mounted in wooden or metal handle. The cylinder, along with the mantra "Om mani padame hum" roll it contains, can be kept turning with a slight rotation of the wrist, With the help of a weighted cord or chain.
This particular image on the left shows the wheel leaning on a wooden rest, and shows the mantra roll removed from the protective case. In the case of a small hand-held wheel like this one the scroll can be a 20 or more yards (meters) in length.
Some of Prayer wheel also for table-top prayer wheels like the shown: which you can spin during your working our to relief your stress.
VISIT HERE TO READ MORE About PRAYER WHEEL http://www.dharma-haven.org/tibetan/prayer-wheel.htm