FriXion clicker pens write smoothly and erase cleanly without smudges or marks, keeping your notes clean and easily legible. The ink that refills these Pilot pens is heat sensitive, erasing with the friction from the included erasers. Use the refills with FriXion Ball and FriXion Clicker pens. Features an eraser to cleanly erase the gel ink without smudging. Thermo-sensitive ink allows you to write and erase repeatedly without damaging or tearing your documents. Fine point is excellent for everyday office use. Compatible with FriXion Ball and FriXion Clicker pens. Greener choice - contains 20% postconsumer recycled content. These erasable gel pens come in black ink.