Kensington : TurboRing The Kensington TurboRing is large ball trackball that utilizes a ring in place of a conventional scroll wheel. The ring is a new technology that is specifically designed for trackballs, offering the ability to scroll through large documents and web pages very easily. Good feel and grip was designed into the scroll ring with a santoprene rubber overmold on an ABS base. The asymmetrical shape of the TurboRing is comfortable to a wide variety hand sizes by positioning the hand into a neutral position.