Advanced free ink system with Cartridge 

When one cartridge used up , you can put on a new cartridge and keep on writing .

1 Blister card includes 2 rollers with 4 roller catridges. 

Tip size : Needle tip 0.38/0.5/0.7 
Ink : Dyebase ink black ,blue ,red ,green 
       Pigment ink black , blue .

Smooth continuos writing , quick dry ink , no smearing , no smudge .