A rollerball pen is a kind of ball pointed pen that uses a water based ink that does not contain a gel.
A liquid ink is a water based ink that does not contain a gel. A rollerball pen is a kind of ball pointed pen that uses a liquid ink.
A rollerball pen is a kind of ball pointed pen that uses a liquid ink. A liquid ink is a water based ink that does not contain a gel.
A rollerball pen is a kind of ball pointed pen that uses a liquid ink. A liquid ink is a water based ink that does not contain a gel.