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. 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
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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I've been using this pen for some time already and I can conclude a few pros and cons of this pen.
1. Very nice and smooth nib, even for the EF nib. I was expecting the EF nib to be a bit harsh on the paper but it's smooth. Very smooth.
2. Very large ink capacity, due to it being a piston filled fountain pen, the ink capacity is enormous. I've filled mine with diamine ink and I can use it continuously for almost a week already. I do a lot of note takings and heavy writing so having a large ink reservoir is a major plus.
3. The pen itself is not too heavy and not too light. I have large hands, so deciding between posting or not posting depends on the user actually. Although posting can throw off the balance of this pen, but on some angles, posting the cap is acceptable.
1. This pen requires care. Because the body is made with plastic, the parts of the pen cannot be screwed too tight. Otherwise you'll crack the plastic.
2. The cap might get lost if you're not careful. Posting the cap may not work if you have small hands.
3. Fairly large pen. If you have small hands, this pen may be too big for you. Once posted, the pen will not be balanced.
Overall, this pen is extremely good in value. One of the cheapest piston filled fountain pens. Definitely would recommend this to a friend.