The TWSBI Obsidian Fountain Pen combines reliable engineering with an elegant, modern aesthetic, making it an excellent choice for both everyday writers and pen enthusiasts. Featuring a smooth piston-filling mechanism and a clear ink window, this pen allows you to monitor your ink level at any time—perfect for long writing sessions or on-the-go creativity.
Its standout feature is the dark marbled resin body, inspired by the depth and mystery of natural obsidian stone. The subtle, swirling pattern adds a sophisticated touch while preserving the functional clarity and durability TWSBI is known for. Designed for comfort, balance, and consistent ink flow, the TWSBI Obsidian is a dependable writing companion for journaling, note-taking, and creative projects.
Every detail matters. The pen cap fits seamlessly onto the back of the barrel, but we recommend keeping it off during use to preserve the pristine finish of your Obsidian.
This is a limited edition release that won't be produced again. When they're gone, they're gone forever. We are officially accepting pre-orders on December 21st - this item launches on December 23rd.
Key Features
- Piston-Filling System for high ink capacity and easy refilling
- Clear Ink Window to monitor ink levels at a glance
- Dark Marble Resin Body with elegant obsidian-like pattern
- Durable Construction designed for everyday use
- Smooth Writing Performance with a choice of nib size
The internal piston-filling mechanism holds about 2ml of ink and can be completely taken apart for thorough cleaning. Instructions and silicone grease are also included to aid in the maintenance of the pen.
TWSBI Obsidian Fountain Pen Specifications
- Edition: Standard
- Pen Material: Resin and Rose Gold color metal
- Nib Material: Stainless Steel
- Filling Mechanism: Internal Piston-Fill Mechanism (Bottled Ink Only)
- Pen Length, Closed: 5.59 in. / 142mm
- Pen Length, Open (Cap Off): 5.12 in. / 130mm
- Pen Length, Open (Cap Posted): Pen cap cannot be posted.
- Pen Max Diameter, Barrel: 0.52 in. / 13.3mm
- Pen Diameter, Grip: 0.4 in. / 10mm
- Total Weight: 1 oz. / 28g
- Packaged in clear case with a wrench and silicone grease.
- Made in Taiwan
A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world:
If you write small, go with an EF
For the normal writer, F is the most popular
If you tend to lean on a bigger font, M will be perfect
B is for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
Stub nibs are italic in writing style (have a special card or invitation to write?
