3 x PILOT FRIXION ROLLERBALL PENS - ERASABLE 0.7mm Tip BL-FR7 (1 X BLACK 1 X BLUE 1 X RED) The FRIXION uses Thermo-Sensitive Ink, which Changes from Coloured to Clear When Heat is Applied 0.7mm Liquid Ink Rollerball Writes a 0.5mm Line The Same Pen can then Rewrite over the Erased Lines Contains 1 X BLACK 1 X BLUE 1 X RED The Pilot Frixion BL-FR7 Erasable Rollerball Pen offers Outstanding Style with High Performance