Out of date Twisted Say 9 ball trackball mouse rendering tight nightmare
Kensington Orbit TrackBall - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Ambidextrous Design, Optical Tracking & 40 mm Ball – Space Grey (64327EU), Silver : Amazon.co.uk: Computers & Accessories
Billiard Ball Trackball Mouse Is Perfect for Gigantic Hands - Hackster.io