UNIBALL Power Tank 0.5mm REFILL SNP5 pressurised ink 

10x BLACK 0.5mm

Features:

• REFILL Ink for Uni POWER TANK pen is always pushed out by the pressure of air

• Ideal for the outdoors or the work which stands and comes out, since it can write also upward 

• Ideal for use in extreme conditions, snow and adventure work

• It is suitable also for writing to a calendar.

• Even if it writes quickly, it is stabilized and ink is pushed out.

• Writes on wet paper, upside-down, in temperatures down to -20 °C