PILOT Frixion Ball Knock 0.5 mm

 PILOT Frixion Ball Knock Pen is one of the best selling pens in Japan with their unique feature of the ink that becomes transparent when rubbed. The color disappears at temperatures above 60°C / 140°F. It uses proprietary "Friction Ink" to create this amazing pen!! If you rub your notes with the special rubber on the back of the pen, the color of the ink becomes colorless and transparent due to the frictional heat generated. Things to note: 5.74" | 14.5 cm long The pen's color is the same as the ink color. It is an erasable writing instrument. Do not use it for items that cannot be erased, such as certificates and addresses.