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Typical swivel caster. A caster (also castor according to some dictionaries) is a wheeled device typically mounted to a larger object that enables relatively easy rolling movement of the object. Casters are essentially special housings that includes a wheel, facilitating the installation of wheels on objects.
1 Body mechanics - refers to the best or safest body position to use in order to accomplish a heavy task.  Casters - the two small wheels at the front (or the rear) of the wheelchair which swivel in all directions. They contribute to the maneuverability of the wheelchair and come in either solid or pneumatic styles.