This is a retractable version of the popular Pilot Frixion line. The pen features the same beloved thermo-sensitive ink that can be erased by friction but now comes in a sleek, retractable body. The special rubber tip at the end allows you to erase conveniently without having to cap or uncap your pen.
Pilot FriXion Ball Knock Retractable Gel Ink Pen – 0.5 mm – Blue Black
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Pilot FriXion Ball Knock Erasable Gel Pen 0.5mm 10 Colors — A Lot Mall