Perixx Peripro-303GR Small Trackball, 1.34 Inches
Wired computer mice might seem archaic, but they're incredibly easy to use. Children, or adults with smaller hands, might find that this mouse works well for them.
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From Amazon
Perixx Peripro-303GR Small Trackball, 1.34 Inches Ball for Perimice and M570, Glossy Red (18021)
£9.99
Conrad Electronic
Perixx PERIPRO-303GR Spare trackball
£11.96
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