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Are you facing the problem that you run out of the ink of the pen?
That problem interrupts your important work,doesn't it?
We designed the pen which has two parts. The first part is major ink and the second part is backup ink.
If you run out of the major ink suddenly, it will remind you to use the backup ink.
Our design make people change ink more conveniently and it also could have the different colors in the same time.
When you friends forgot to bring pen, you can share half to them.