New bright colors appeared on the frixion ball 4 series. You can enjoy four colors of Pilot frixion erasable gel ink in one pen body. Like Magic, its thermosensitive ink turns invisible when you rub with rubber built into the top of the pen. Also, unlike an eraser, the residue does not come out. You can write many times on the same place. ※Please do not use for documents which should not disappear. (Certificates, address etc.)