The difference is while ballpoint pens use thick, oil-based inks, and rollerballs use a free-flowing, water- and dye-based ink, gel pens use ink made of pigment in a water-based gel made from ...

use a thick oil-based ink that's less likely to pool, but may require more pressure, which could cause unwanted indentations if it's not an especially smooth model. Gel pens use a water-based gel ...

The difference is while ballpoint pens use thick, oil-based inks, and rollerballs use a free-flowing, water- and dye-based ink, gel pens use ink made of pigment in a water-based gel made from ...