The Pilot Plumix fountain pen in Purple with a 1.0mm stub nib is a hit with fountain pen users! These refillable pens were specifically created for smooth writing, and the clear translucent body allows for easy visibility of the ink supply. Each Pilot Plumix fountain pen comes with one ink cartridge, and these easily refill with the standard Pilot IC-100 ink cartridge, or the Pilot Con-20 converter fits as well, if you would like to use bottled ink. Many fountain pen aficionados like to use this 1.0mm stub in their Pilot Prera or Pilot Metropolitan fountain pens, as a fun change as it is easily removed!