The new "capless" rollerballs are what's confusing the issue. Used to be a rollerball had lower viscosity ink, more like what's used in a fountain pen, that writes bolder and dries slower than a ball point.
Then they made gel refills, which write almost as bold as a rollerball, dry faster, and don't have to be capped. I like the Parker brand gel refill replacements for ball point pens.
Now several manufacturers have come out with "capless" rollerballs. What is that?[?] Seems like nothing more than a gel refill with a more expensive name.
Happy holidays,
txbob in Marble Falls TX