Pilot Frixion Synergy Knock Refill 0.3mm 0.4mm 0.5mm Limited Edition

This 0.4mm refill is compatible with the Frixion Point Knock. The black, blue and red refills come in a set of three while other colours are available in a single piece.

This 0.4 mm refill features erasable FriXion gel ink and Pilot's unique Synergy tip, which combines the precision of a needle point with the durability of a conical point. Use it in the pens listed under Compatible Products.

FriXion pens use a special thermosensitive ink that turns invisible when rubbed with the built-in friction "eraser." The ink disappears cleanly without using up the eraser or creating any dust or smearing. The ink will also disappear if exposed to other sources of heat or friction, so we advise against using these pens to address envelopes or leaving anything written with them in a hot car. Like magic ink, erased FriXion ink reappears if placed in a freezer or otherwise exposed to temperatures below 14° F (-10° C).