A pressurised ink delivery system enables the PowerTank pens to continue writing upside down, in extreme cold (up to minus 20 degrees), on shiny surfaces, wet paper and even underwater.

Uni’s unique Super Ink is a pigment ink that offers outstanding levels of water, chemical and light resistance.

The pigment in Super ink binds with the cellulose in the paper making the ink permanent once it’s dry. This means that your signature is secure.
Important information or legal documents can’t be changed and your signature can’t be removed.

Complies with ISO 14145-2, the international standard governing the quality and performance of rollerball pens for use on official documents.