Erasable Gel Ink Refill Cartridge.

The gel refill comes in two colours - blue and black.
To replace the refill unscrew the writing tip to remove and replace cartridge.
Erasable Pen is a special refill, which is different from the ordinary refill.
If the refills of Erasable Pen experience high temperatures
(this may be during transport) the color of pen refills may change colour (will become milky white), and may even lead to refills that will not write.
If you encounter such a situation, you can freeze the pen refills
in the freezer compartment.
After 12 hours, the color of pen refills will return to normal.
Remove the refills from the freezer - you need to wait 1-2 hours, the refills can be used.