Signo Erasable Pens

The Signo TSI is an erasable rollerball pen that contains a new erasable ink formula. The pens name TSI refers to its ink which is known as thermo sensitive ink. This ink changes from a coloured ink to a clear ink when heat is applied therefore erasing the ink.  It can then be written over using the same pen.
To erase the ink you use either the eraser at the end of the barrel or on the end of the cap rubbing over the ink to make sure it has completely gone.
The pen has a 0.7mm tip that writes a 0.5mm line. There are 7 vibrant colours.