Left handed? Right handed? When you're working on your computer day and night, and you want more flexibility, the Logitech Trackman Marble will help increase your comfort level.
A trackball design with a long, broad palm area and gentle curves keeps your hand comfortable and supported all day—whether you use your right or left hand.
More information: http://www.logitech.com/en-us/product/trackman-marble?crid=7