Pilot Gel Ink Refills for FriXion Erasable Gel Ink Pen, Fine Point, Black Ink, 3 Packs containing 3 refills each total of 9 refills (77330)

Total of 9 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!