Pilot Frixion Ball Knock Click Retractable Erasable Gel Ink Pens,fine Point, 0.7mm Black,Blue,Red,Blue Black Ink, Each 1 Pen- Value set of 4 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