This is related to the quality of the pen and the material selected for the nib.
There are also regional differences.
The north is dry and the south is wet.
Therefore, brushes in the south rarely crack.
But as soon as it reaches the north, it may crack.
I don't know whether you mean a pen or cocaine.
If you write it,
I suggest you buy bamboo brush hair.
And the one with the winding in the front.
However, because the factory thread is not strict.
Post it again with .502 when you come back.
Then this pen won't crack easily.
If the pen is broken, there is nothing you can do.
Then clean the pen after each use.
Hang upside down on the pen rack to dry.
Never wear a pen cap again