Pilot Gel Ink Refills for FriXion Erasable Gel Ink Pen, Fine Point, Blue Ink, 6 Packs total of 18 refills (77331);

6 Packs containing 3 refills each total of 18 refills: The technology used in FriXion erasable gel ink pens has been in the making for more than 30 years. Vibrant Autumn leaves inspired a Pilot researcher to capture the same dynamic color change in a test tube. A special formulation that would vividly change color at different temperatures was developed. The unique color-changing technology was initially used to create children's toys. Several years later, another Pilot researcher modified the formulation to create disappearing ink-and FriXion erasable gel ink pens were born!