These two erasable pens use the latest ink technology which is called the thermochromic ink. The ink will disappear when heated and revealed when cool it in a freezer temperature below -10 degrees Celcius.
Links to buy the FriXion Ball Pen:
Clicker Type: http://pilotpen.us/categories/frixion...
Cap Type: http://pilotpen.us/categories/frixion...
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