Frosted Sport Fountain Pen - Blueberry This new finish to the classic Kaweco compact fountain pen is semi-translucent. We have this frosted finish in 4 different colours of fountain pen - banana, fine lime, coconut and this colour which is called blueberry. You can make out the internal workings of the fountain pen and see the cartridge. The stylish and compact design of these pens mean they can be easily kept in a pocket or bag. The large cap unscrews and the two parts can then be slid together to form a standard sized pen. Kaweco have been making pens in Germany since 1883. We also have the fountain pen available in other colours. Length when closed: 10.5cm. Length when open and extended 13cm.