Technology Rollerball stylus

[MastahRiz]

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I've been trying to find a rollerball stylus for a long time but there are so many pen and stylus combos that just searching for it online is nearly impossible.

I'm not looking for a stylus that also has a rollerball pen on the other side, I'm trying to find a stylus that has a rollerball for the stylus portion itself, so that stylus can roll rather than drag/slide. Do these exist?

Thanks in advance.