Enjoy smooth and consistent writing with the unique Synergy tip, which combines the precision of a needle point with the durability of a conical point. Erase and write repeatedly with Frixion's unique thermosensitive gel ink that disappears with friction. Just push the clip to extend and retract the tip. The special rubber eraser at the top of each pen allows you to erase conveniently without pressing the retraction mechanism. Erase and rewrite repeatedly. Refillable with LFRF.