TWSBI pens made by one of Taiwan's most expereince 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.
Length with cap close - 14.1cm
Length with cap posted - 17.5cm
Central circumference - 4.2cm
Sytem: Fountain pen uses Piston-filled ink.
Nib type: Steel nib
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Very wet and smooth
The writing experience of 580 is similar to Eco however is much more elegant, from the nib to the body, and the same problem is the cap cannot be posted very well. Btw, the balance of the pen doesn't feel good after posted. Personally, i would rather buy Eco if the elegance of pen is ignored, nevertheless, it's worth to buy under the pricing, would buy another soon...