[angry-hacker]

Why specifically this brand? Is it special, and is the difference between an avg random pen big?

[tass]

Frixion pens are erasable.

The ink turns invisible when heated. The pen has a rubbery tip on top which acts as an eraser when rubbed on the ink.

[plttn]

You'd be surprised. Pilot G2 is a great writing pen, and I'm personally a fan of Uniballs.