The OEM Free Ink Rollerball Pen NSN4612664 is designed for exceptionally smooth, clean writing. It combines the writing experience of a gel pen with the strength and durability of a ballpoint pen. The translucent barrel allows for visible ink supply, ensuring you never run out unexpectedly. This pen features water-resistant, fade-resistant, acid-free, and liquid pigmented black ink with a 0.7mm fine point, making it ideal for both professional and personal use.