Pilot FriXion Rollerball Pens Retractable All-in-one pen (pen, eraser and re-writer) Write, delete and repeat with the same pen Deletes easily, with no dust and no chemical residue Smooth gel ink Fine tip 0.7 tip gives line width of 0.35mm Packed 12. Erases cleanly by friction-generated heat, leaving no debris. Uses the same ink to write and over-write. Fine 0.7mm tip. Uses the standard FriXion ball or FriXion point refill. This product is not recommended for signatures, legal documents, examination papers or other documents where writing needs to be of a permanent nature. To avoid accidental erasure, do not leave writing where it may be subjected to high temperatures for a prolonged period.