Description

The TWSBI Obsidian Fountain Pen is a special edition piston filler that combines elegant design with exceptional writing performance. Crafted from high-quality acrylic with a deep Obsidian finish, this pen features striking Rose Gold hardware including the nib, clip, and rings — making it as beautiful to look at as it is to write with.

Filling the pen is simple and satisfying — twist the end knob to draw ink directly into the barrel, giving you a generous ink capacity ideal for long writing sessions or everyday use. The piston filling mechanism is smooth, reliable, and easy to maintain.

Available in Extra Fine, Fine, and Medium nib sizes to suit all writing styles. Whether you write small and precise or prefer a bolder, more relaxed line, there is an Obsidian nib for you. As a limited run special edition, this pen is a collector’s piece that won’t be around forever.

Not sure which nib to choose?

EF – For small, precise handwriting.
F – The most popular choice for everyday writing.
M – Perfect for broader, more expressive strokes.