Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring & Mouse Mat with Wrist Rest – Ergonomic duo gel wrist support for computer/laptop Blue: Amazon.co.uk:
Kensington Expert Wired Optical Trackball Mouse Black 64325
Kensington Orbit Wired Trackball Mouse with Scroll Ring K72337EU AC07393
Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Blue (K72337EU): Amazon.co.uk: Computers & Accessories
Kensington Orbit Trackball Mouse with Scroll Ring (K75327WW) : Amazon.co.uk: Computers & Accessories
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