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The FriXion Synergy Knock gel pen pairs the beloved thermosensitive ink of FriXion pens with a sleek, retractable pen body. Just push the clip to extend and retract the tip.
The special rubber eraser at the top of the pen allows you to erase conveniently without pressing the retraction mechanism. The pen writes smoothly and erases without a trace!
The Synergy Knock also features Pilot's unique Synergy tip, which combines the precision of a needle point with the durability of a conical point. The translucent clip matches the ink color, and the pen's tip size is indicated by the eraser color.
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, 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).
