Innovative pens in the Frixion series from Pilot Pen are like any ballpoint pen, fineliner or highlighter pen, but not at all. The ink is heat-sensitive and erases with friction, which means that it is in the middle between pencils and ink pens with properties from both sides.
Avoid laying your notebook in the sun on a hot summer day, then the ink can fade accidentally... Frixion is the perfect pen for studies, lists, notes and crosswords!