Pilot FriXion Synergy Knock Gel Pen Refill

Erasable FriXion gel refill with Pilot's Synergy tip—a hybrid design that pairs needle-point precision with conical-point durability. The thermosensitive ink vanishes when friction-erased, leaving no dust or residue. Heat or friction will also erase the ink, so avoid using on envelopes or in hot environments. Erased writing reappears if exposed to freezing temperatures below 14°F. Compatible with Pilot FriXion Synergy pens.