Reference: OCT-TD
Brand: Uniball
Uniball UB-215 Refillable Liquid Ink 0.5mm Micro Roller Pen (Black Ink)
Refillable direct liquid roller pen 0.5mm Tungsten Carbide ball uni-ball 215 ensures smooth writing like the conventional uni-ball series but also can replace the refill. Write until last drop of ink. Able to check the remaining amount of ink through barrel window. Once you used up ink, you can replace with refill "UBR-85