Karas Kustoms Vertex pens are a bold acrylic addition to the world of fountain pens. Black veins flow through red and orange flames in the cap and barrel. The snap cap is super strong. Only minimal wear will be found on the pen. You fill it with an included converter, but it also accepts standard international cartridges. Click the headline for close-ups. Its steel nib has a great design, and it writes a nice broad line with a little feedback. You'll see the nib is marked double broad, but we never got it quite that thick. nice wider grip and light weight. 13.2cm capped.