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Kensington SlimBlade Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Red (K72327EU) : Amazon.co.uk: Computers & Accessories
Kensington Trackball Mouse Original SlimBlade Wired Mouse Media Control for PC or Laptop with Large Ball for AutoCAD K72327 - AliExpress
Kensington K72327 SlimBlade - Wired Ergonomic TrackBall Mouse for PC,