These pens write smooth & erase clean with unique thermo-sensitive gel ink. No, wear or tear so you can erase & rewrite until it’s right without ruining the page. Friction erasable pens let you enjoy smooth writing while leave room for error. New thermosensitive ink will disappear with friction using the rubber eraser on the pen with no residue and no tearing of paper. Write, remove, rewrite without damaging documents. Retract the tip back after use to prevent it from drying out. Avoid direct sun exposure and high temperature. If the pen does not work, try to scribble on paper for seconds to make the ink run again.