Mr. Pen- Retractable Mechanical Eraser Pens, 6 Pack, Vibrant Colors | Latex-Free Precision Pencil Erasers for Artists, Students, Drawing, Sketching & Drafting

Customers find these erasers fantastic for larger areas and appreciate that they don't leave smudge marks on paper. They like the colors and consider them good value for money. However, the functionality receives mixed feedback - while some say they work well, others report that the retractable ones don't function properly. Moreover, durability and ease of use are also mixed aspects, with some finding them sturdy and easy to use while others say they're not very strong and awkward to handle. The staying power is particularly problematic, with multiple customers reporting that the eraser won't stay in place.