This artista fountain pen kit for example: it is a demonstrator pen, being made out of clear plastic, with chrome trims. But it has some remarkable features, like the clear plastic feed, which looks very cool, and I never saw one before. Or the fact that they sell them in a kit, where they include a little container with a variety of coloured ink cartridges, so when you put a different colour in it, and because it is a demonstrator, the pen itself gets another colour as well! But they also include a converter, so you can fill it up with your favourite ink, a cool thing about the converter: all plastic parts are also made out of clear plastic!
|a clear plastic feed, ...|
|... and a clear plastic converter|
It writes even better than how it looks, it is just a plain, standard, small nib but it writes surprisingly well! The M nib barely skips, and it produces a very nice wet line!
Note: I don't know if they still sell them as this 'kit' with coloured ink cartridges!