No difference in quality from the original Dell ones, I use one myself on my own laptop. Will fit pretty much all/most models of Dell.
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Pointing stick, Ultimate Pop Culture Wiki
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LeFix Pack 2 Replacement Trackpoint Cap Mouse Point Stick Nipple for Dell E6400 E6410 E4300 E4310 E5410 E5500 E7240 E7440 E7250 E7450 : : Electronics
Why do some laptops have a small red button in the middle of the keyboard? - Quora
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