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Mouse Ball 1.5"
Are these the mouse's testicles? : r/PetMice
5-Pack Replacement PC Mouse Ball, 21.8mm, CablesOnline MS-B01-5
Why do male mice have such large testes? - Quora
Mighty mouse balls
Science With Screens: Experiment 14: What's in a Computer Mouse Ball?
Having to clean the mouse ball (and sometimes just playing with it for no reason) : r/nostalgia
sexing a mouse - Little P.A.W.S
Mouse Balls Available as FRU (Field Replacement Unit) - IBM memo circa 1991 : r/ProgrammerHumor
Taking the ball of out your computer mouse to clean it. I remember by high school, the IT dept glued this shut to avoid mouse balls gone missing : r/nostalgia
Removing the ball from your computer mouse : r/nostalgia