The Uni-ball Signo TSI contains a new generation of specially formulated thermo sensitive ink. By using the pens eraser the rubbing action causes friction making the coloured ink change to clear hence rendering it invisible.
This pen has two eraser's one on the cap another on the end which is ideal for those that like to post the cap on a pen as there is no need to keep removing the cap to erase errors. The Thermo Sensitive gel Ink could re-appear if used in temperatures below -18°C but in normal conditions a vigorous rub will enable you to erase & rewrite anything.
The Signo TSI Erasable Rollerball Pen has a 0.7mm tip & there are 7 vivid colours to choose from including violet, sky blue & pink.