The X-keys O-Trac Trackball contains a large, high-density trackball inside of a high impact ABS molded enclosure. The enclosure is ergonomically designed to fit the contour of the hand which allows for no movement of your arm or wrist from side to side. The trackball accommodates both left and right-handers as well as hands of all sizes. The easy to use trackballs are suited for those with disabilities and physical handicaps. The faster you turn the trackball, the faster the cursor will move across your screen! The large, high-density trackball paired with the stainless-steel rollers delivers a ‘smooth-as-silk' feel and effortless control.