UNI POWERTANK PEN black

Why have different pens for different tasks when the Power Tank does them all?
Power Tank is Uni’s ”heavy duty pen”, which can write upwards, write on wet paper and write in down to 20 degrees frost!
The pens have rubber grips. 55% of the pen is made from recycled plastic.
The ink meets the requirements for archival durability according to ISO 12757-2.