The TWSBI Diamond 580AL Turquoise Fountain Pen is a must for your fountain pen collection. It is only available in limited supply and Skribr is excited to be one of the few retailers stocking this pen. The Diamond 580AL features an innovative design with a diamond shaped transparent barrel so you can see the inner workings of the pen as well as the ink colour. The Diamond 580AL features a benchmark piston ink-filling mechanism and has all detachable parts. Features turquoise aluminium machined grip, connector and piston rod. It's not hard to see why TWSBI has become one of the most in demand fountain pen brands in recent years. Comes with a fine nib.