BLACK PILOT FRIXION ROLLERBALL PENS - ERASABLE 0.7mm Tip BL-FR7 (PACK OF 3) 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 3 x Black The Pilot Frixion BL-FR7 Erasable Rollerball Pen offers Outstanding Style with High Performance