The Pilot Frixion Slim Gel Pen allows you to erase mistakes and rewrite over them simply by rolling the end of pen over the error to turn the ink clear. It features a super fine 0.38 mm tip for detailing your work and is retractable for safekeeping when it's not in use. The pen lacks a pocket clip so you can carry more of them in your pencil case and a hole at the top so you can slip a string through and carry it on your lanyard.