Retractable gel pens feature erasable thermo-sensitive ink to let you write smoothly, erase cleanly and rewrite repeatedly without damaging your documents. 1.0mm, medium tip writes crisp, bold lines for easy readability. Plus, the unique erasing tip erases marks completely without leaving any messy eraser crumbs. Gel pens with black ink are perfect for students, administrative assistants, teachers, scheduling coordinators and more.