This uni power tank ballpoint pen refill allows you to restock the ink supply in your uni power tank pen. The refill features a pressurised ink delivery system which allows you to write upside down, in extreme temperatures, on wet pages and even underwater.
It is compatible for use with your uni powertank ballpoint pen. The special ink delivery system allows you to write in extreme environments. This refill has a 0.7 Mm nib size.