The TWSBI Diamond Mini AL Blue Fountain Pen has an innovative design with blue aluminium grip and blue end cap. Features a transparent barrel so you can see the inner workings of the pen as well as the ink colour. The Diamond Mini AL features TWSBI's famous ink-filling mechanism and has all detachable parts. TWSBI Diamond Mini AL is 2.5cm shorter than the Diamond 580. Comes with a medium nib.