From the manufacturer:
Refill for the MONO Zero Eraser, Rectangle Tip. Protect your work and erase only what you need with high-quality, precision erasers that will not damage paper. With tips in two shapes and sizes for correcting work, the pen-style body is easy to use and store.
- Rectangle; 2.5mm
- Ultra-fine precision tip
- Refill for the MONO Zero Eraser, Rectangle Tip