The BLX series gives classic black ink a drop of colour for a sleek, sophisticated take on your writing.Uni Super ink is specially formulated to become trapped in paper, helping prevent criminal cheque washing and other document alteration.Quick-drying, acid-free, archival-quality ink is fade- and water-resistant to last over time.Uni-flow system ensures a steady flow of ink for consistent line and colour intensity.The vented refill means the pen won't leak or explode on aeroplanes, making it ideal for business travellers.Visible ink supply so you know before you run out.Rollerball tip delivers consistent, free-flowing writing.It has the feeling of a fountain pen, without the mess.Bold point produces thick, vibrant lines.