Smooth writing experience with your existing pen: The ink cartridge contains good ink in blue and black, ensure you a smooth and unimpeded writing experience as your fountain pen glides elegantly across paper, not an easy to block the ink holes and leak, a good assistant in your life of Writing. Quick to dry: With quick drying ink, you can no longer worry about the words you just wrote will be rubbed off or dirty your hands and clothes after a few seconds, ensuring your important writing moments are not ruined by smudges