TWSBI pens made by one of Taiwan's most experience pen maker who started out as a contract manufacturer. The Diamond features a clear demonstrator body with a piston filling mechanism; these attributes combined with its low price make for a very enticing pen. The body is made of a round clear plastic allowing you to see the internal piston mechanism and the feed. Improved grip and end barrel section compared to 540, 580 has increased ink capacity, about 30% more than 530, 580 has improved the smoothness of cap thread turning. This is the mini version of the 580 AL. Now available in purple grape color aluminium.
Length with cap close - 11.5cm
Length with cap posted - 14cm
Central circumference - 4.1cm
Sytem: Fountain pen uses Piston-filled ink.
Nib type: Steel nib