mechanical pens because their tips tend to smudge if left in a pocket unguarded.
Rollerball Advantages
Rollerball pens do have their own disadvantages, including easier smudges, bleeding through the paper, possible clogging, and the dangers of check washing. But they also have advantages that draw people to them.
* Rollerball pens are easier to write with because they require less pressure. It just slides across the paper.
* Since they use water soluble dyes, rollerball pens have a wider variety of colors.
* Their lines tend to be more clear and solid.
