The Frixion Erasable Rollerball Pack of 3 is a unique set which erased writing. This Pack of 3 Erasable 0.7mm pens erases writing by friction-generated heat. Just rub rapidly, using the end stud on the pen barrel, or a similar material. This set would be ideal for writing notes in diaries and or for your Sudoku"s (not on newspapers) • No eraser debris or glossing of the paper • No chemicals needed to erase • Erases cleanly • Same ink writes and over writes • All in one pen!