The Pilot FriXion Gel Pen Refill Pack has 3 refills for the Pilot FriXion Ball Knock Retractable Gel Ink Pen and regular Pilot FriXion Erasable Gel Ink Pens in 0.5 mm size. It features the advanced "thermo-sensitive ink". You can easily erase your mistakes with its thermo-sensitive ink.The special pilot ink technique - when temperature reach the point, ink becomes transparent automatically by rubbing with the rubber at the end of the pen. The change of the ink is based on the change of temperature and will not leave any dirt or smearing.
Precisely as required and I
Precisely as required and I love reusables as I worry a little throwing too many plastic pen cases away, I am hoping cartridge refills are slightly more efficient. De Charles.