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 ofPilot Frixion pen turns the ink invisible.
Available ink colors:Black.Red.Blue
Tip size:0.38mm
Length:8.8cm
Manufacturer:Pilot
Model Number:LFBTRF30UF3B.LFBTRF30UF3L.LFBTRF30UF3R