TWSBI Classic Fountain Pen - Sapphire BlueWith TWSBI the game has changed! TWSBI combine simplicity and elegance in the very contemporary Classic fountain pen. By using a piston ink filling system, TWSBI has been able to create a fountain pen with very high ink capacity. What this means is that you no longer need ink cartridges or a converter just fill this high capacity fountain pen and away you go. Why use this pen? The nibs are fantastic, the styling is amazing, you will be asked about it