The Tombow MONO Sand Eraser (57304) is a specialized eraser designed for effective removal of colored pencil and ink marks, including ballpoint and rollerball pen ink directly from paper surfaces. Made from natural rubber latex combined with fine silica grit, its slightly abrasive texture gently sands away tougher marks that ordinary erasers can’t easily handle.  This compact rectangular eraser is ideal for artists, students, and professionals who need reliable performance on a variety of media, especially when working with colored pencils or stubborn ink. Though it works best on thicker paper due to its sanding action, it offers smooth, controlled erasing without tearing when used carefully.