Water-based gel ink ballpoint pen 0.5mm Black ink LFBKZ-2SEF-DR I bought this and stored it at home. I'm selling it because I don't plan to use it. I opened it for the photos, but it's unused. The box will be folded and included. Type: Ballpoint pen Ink: Water-based Ink: Gel ink Features: Erasable by friction Popular model: Frixion Ball Model number: Knock Zone