This multi pen features a slim, smooth body that easily slips into pockets or pen loops. Like magic, its thermosensitive ink turns invisible when rubbed with the special friction eraser built into the top of the pen. The ink will also disappear if exposed to other sources of heat or friction, so we advise against using these pens to address envelopes or leaving anything written with them in a hot car. Interestingly though, erased FriXion ink reappears if exposed to temperatures below 14° F (-10° C), like if it is placed in a freezer—it's like magic ink!
