A stress ball is a small squeezable ball used to aid the combat of RSI (repetitive strain injury) and helps with the general well being of staff in the workplace.  Stress Balls come in various shapes and sizes, from the standard round ball to extravagant shapes like the X-Man (pictured).  Stress Balls are used in promotional activities where companies' place their logo and or contact details on the item and distribute them to colleagues, through the postal service or at exhibitions and trade shows to potential customers.  Businessmagnet lists suppliers of stress balls which can also be known as stress toys.