The Pentel Clic Eraser is a thin holder-type eraser that is easy to carry in your pen case. This eraser comes in options beyond erasing pencil marks! The Pentel Clic Eraser comes in three types: Clic Eraser Pro for Mechanical Pencil, Clic Eraser Sand for Oil-Based Ballpoint Pen, and Clic Eraser Hyper for printed inkjet papers and ballpoint pen. The refillable eraser is only 3mm thin, so it's very easy to erase even tiny mistakes!