Pilot FriXion is a brand of erasable gel pens that use a unique thermosensitive ink. This ink becomes clear when exposed to heat, allowing users to erase their writing by simply rubbing the tip of the pen against the paper. The pens are available in various colors and tip sizes, making them popular for both students and professionals. The FriXion pens are designed for smooth writing and quick drying, reducing the chances of smudging. They are refillable, which makes them an eco-friendly option. These pens are widely used for note-taking, journaling, and creative projects due to their versatility and ease of use.