The pens have a special rubber end to rub the thermo sensitive ink away with, thus no eraser by-products are produced, yet the ink disappears magnificently. The pen writes smoothly, in vibrant colors, and erases without a trace.
Because the ink in this pen is thermo sensitive, we do not advise for it to be left in hot cars, used for mailing, or subjected to a condition that exposes it to a lot of friction.