The Pelikan Twist is a cartridge converter. Pelikan uses the standard international cartridge and converter size. There is no shortage of standard international sized ink cartridges. When I had initially unscrewed the barrel I had hard time getting the facets to line up. Turns out, you have to twist the barrel close. You will feel it click into place when you finally get the barrel closed.
The Pelikan Twist came with a medium steel nib. It is a smooth writer but it is very much a wet nib. As a lefty, it is usable only if I fill it with a dry ink like Pelikan or Graf von Faber-Castell inks.
I enjoy the bright colour and the smooth nib that the Pelikan Twist has but I could really do without the harsh moulded grip. This is an interesting choice as a beginner fountain pen. If I had to learn how to grip a pen again, I might choose to do it with the Pelikan Twist. At least, I would be forced to do it correctly.