Frixion Point Clicker retractable Ink Type: Erasable Ink Point Size: 0.5mm Write, Erase and Rewrite. Retractable model with new innovative Synergy Tip. Conical tip with needle point; hybrid tip offers the combination of precise yet extremely smooth writing. Thermo sensitive gel ink that disappears with friction using the rubber tail tip on the pen with no residue and no tearing of paper. No cap to remove to get to erasing tip! Smooth writing gel ink. This product is not recommended for signatures, examination papers or official documents. If pen is exposed to extreme heat (>= 60°C), the ink will disappear. To restore color, cool to at least -10°C in freezer and ink will reappear.