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From my reading of the articles for rollerball and ballpoint pens, it sounds like as far as the physical parts of the pen are concerned, there isn't a difference, and that the difference is in the quality of the ink, with ballpoint ink being thicker and rollerball ink being more watery. But am I wrong? Ignoring everything about the ink, is there a common constant mechanical/parts difference between ballpoints and rollerballs? 20.137.7.64 (talk) 17:05, 27 April 2015 (UTC)