TWSBI Obsidian Fountain Pen

The TWSBI Obsidian Fountain Pen is what happens when dependable engineering meets a touch of geological drama. Its marbled dark resin body takes its cue from obsidian—deep, mysterious, and rather captivating—yet never at the expense of everyday practicality. You get a smooth piston-filling mechanism, a clear ink window, and a writing experience that always feels balanced and confidently consistent.

Pick it up for journalling, note-taking, or the occasional burst of late-night brilliance; the Obsidian never complains and never runs dry without warning. Whether you’re edging into the world of fountain pens or adding another gem to an already healthy collection, this TWSBI design offers beauty, sturdiness, and ease in equal measure.

Clever Details That Count

• Ink you can rely on: The piston-filling system gives you generous capacity, so you don’t stop mid-thought—or mid-sentence—ever again.

• A body with quiet allure: The marbled resin shell brings depth and character without tipping into showiness, offering comfort and durability for all-day writing.

• Clarity when you need it: The ink window keeps you informed at a glance, meaning you never gamble on how much ink remains.

Details

• Sizes: Extra Fine, Fine, Broad, Medium
  
• Material: Resin, Steel
  
• Country of Origin: Taiwan