Why do some women stare at my hands?

In one of my college classes, I notice the 2 women sitting next to me, constantly staring at my hands. Do they have a hand fetish? Not that I have a problem with them staring at my hands though. My hands are in good shape, because one of my hobbies is using hand grippers (you can see one on my cover image).
Why do some women stare at my hands?
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