Pilot FriXion Ball Knock Retractable Gel Pen Refill - 0.4 mm - Pack of 3
It's filled with Pilot's unique thermo sensitive gel ink that flows smoothly and consistently. The heat generated by friction when rubbing the paper with the rubber tip of Pilot Frixion pen turns the ink invisible.
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Available ink colors: Black, Red, Blue
Tip size: 0.4 mm
Length: 11 cm