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Question: What is the difference between a Ballpoint pens/refills and Rollerball pens/refills?Answer: Ballpoint pen refills use a thick oil based ink where the ball in the pen nib pushes the ink on to the paper. Ballpoint pens have a thick ink that does not evaporate easily. A cap is not necessary. Ballpoint ink is less likely to bleed through the paper.A Rollerball pen is more related to the fountain pen as it uses a water based ink. The Rollerball pen and refill was first introduced to fit the demands of loyalists of fountain pens that missed the use of a...