The Frixion Fineliner is a unique fine line marker pen with innovative Frixion thermo-sensitive ink. The heat generated by friction when rubbing the paper with the special tip turns the ink invisible. With no damage to the paper, you can erase and instantly re-write over your mistakes. Polyacetal tip provides soft writing touch, requiring no writing pressure. Suitable for writing and drawing. NOTE: Do not use Frixion on legal documents, cheques or when writing exams. 1.3mm tip gives a 0.45mm fine line. Green ink. Purchase 12 to receive a box.