Which makes it your perfect tool for the big clean surfaces

and technical ink work — no tip fraying

even washes under a wet brush

Surfaces: Concrete

5 mm lead through a side button rather than a top push-cap

uni power tank ball point pen snp 10 refill 1 0mm Boner Which makes it your perfectThis is the replacement cartridge for the uni Power Tank SN 220 pen series, built as a self contained pressurized capsule rather than a standard open vent refill the internal air pressure is what actually drives the ink forward, so a regular gravity fed refill wouldn't work the same way in this pen. Swapping the cartridge takes only a few seconds and fully restores the host pen's ability to write upside down, on wet surfaces, or down to 20C, since