Pilot Frixion Ball Knock Retractable Erasable Gel Ink Pens,fine Point, 0.5mm - Blue Ink- Value Set of 3 & 3 Gel Ink Pen Refill Pack Combines the convenience of a retractable with the incredible FriXion erasable gel ink Erase and rewrite repeatedly without damaging documents - Eraser is at the top of the pen, tip is retractable by pressing clip down Unique Thermo-Sensitive gel ink formula disappears with erasing friction