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65 products
65 products
Replacement Nib Units for TWSBI Fountain Pen
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TWSBI 580
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TWSBI Mini
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TWSBI Vac Mini
The TWSBI Kai fountain pen is a striking Limited Edition release that blends refined color with elegant detailing. Featuring a rich blue pebbled body paired with rose gold trim and nib, the Kai offers a distinctive look that feels both modern and sophisticated.
Built with TWSBI’s trusted piston-filling system, the Kai allows you to fill directly from bottled ink while providing generous ink capacity for extended writing sessions. Its balanced design and comfortable grip make it ideal for everyday writing, journaling, or adding a touch of style to your desk.
The pen is fitted with a rose gold–plated stainless steel nib available in multiple sizes, delivering smooth, consistent ink flow and a reliable writing experience.
TWSBI Obsidian
Condition: 3. Very Good, has some scratches on the body
Nib: Medium Stub Stainless Steel (Bronze Colored)
Filling System: Piston
Specifications:
Closed: 141.8 mm
Open: 128.3 mm
Barrel: 14.9 mm
Section: 10.4 mm
The TWSBI Obsidian fountain pen is a striking Limited Edition release that pairs bold styling with the reliable performance TWSBI is known for. Finished in deep black tones reminiscent of polished volcanic glass, the Obsidian offers a sleek, modern look that stands out while maintaining an elegant simplicity.
Designed with TWSBI’s trusted piston-filling system, the pen allows you to fill directly from bottled ink while providing generous ink capacity for extended writing sessions. The balanced construction and comfortable grip make it well suited for everyday writing, journaling, or collecting.
Fitted with a smooth stainless steel nib available in a variety of sizes, the Obsidian delivers consistent ink flow and a dependable writing experience.
While the pen cap will physically fit onto the back of the pen body in a way that would be considered ‘posting’, TWSBI recommends NOT doing so to avoid potentially scratching the barrel.
The Obsidian color features a new coloring technique in the injection molding process to create unique patterns and colors. Every single pen will be unique.
The TWSBI Precision Gemini fountain pen combines modern industrial design with dependable fountain pen performance. Crafted from durable aluminum and finished in a striking two-tone silver and black look, the Gemini stands out with its clean lines and precisely machined facets that provide both visual appeal and a comfortable grip.
Equipped with TWSBI’s reliable piston-filling system, the Precision Gemini allows you to fill directly from bottled ink while offering generous ink capacity for long writing sessions. Its solid metal construction provides a balanced, substantial feel in hand, making it a great choice for writers who appreciate a sturdy, well-engineered pen.
Fitted with a smooth stainless steel nib available in multiple sizes, the Gemini delivers consistent ink flow and a comfortable writing experience for everyday notes, journaling, or professional use.
It uses the same nib as the TWSBI Diamond 580; however the 580 nib unit itself is not compatible in the Precision. Only the nib is swappable.
The TWSBI Precision Gunmetal fountain pen blends modern engineering with a sleek, industrial aesthetic. Crafted from durable aluminum and finished in a refined gunmetal tone, this pen features clean lines and a distinctive faceted design that offers both visual appeal and a comfortable grip.
Built with TWSBI’s reliable piston-filling system, the Precision provides a generous ink capacity while allowing you to fill directly from bottled ink. The solid metal construction gives the pen a substantial, balanced feel in hand, making it ideal for writers who prefer a slightly heavier, more robust writing instrument.
Equipped with a smooth stainless steel nib available in a range of sizes, the Precision delivers consistent ink flow and a dependable writing experience for note-taking, journaling, or everyday use.
It uses the same nib as the TWSBI Diamond 580; however the 580 nib unit itself is not compatible in the Precision. Only the nib is swappable.
NOTE: If you choose to add a custom grind to your pen, this will add the time to when it will be shipped.
ECO-T has a slightly more pronounced grip section; to help with learning correct writing posture for kids, new enthusiast, and anyone who likes a little bit more structure to the grip area. Cap and end cap also has a rotary triangular shape design.
Comes in EF, F, M, B, Stub 1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.https://www.penrealm.com/wp-admin/post.php?post=7435&action=edit#edit_timestamp
Simply unscrew the end cap, dip into ink, screw back the end cap, and your done! Ready to write!!
Pen cap has an inner cap to insure a perfect seal when stored away.
Made for the beginner who just wants to try out fountain pens, all the way to the experts. A good everyday worker.
Please note: Ink is NOT included
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?)
NOTE: If you choose to add a custom grind to your pen, this will add the time to when it will be shipped.
Comes in EF, F, M, B, Stub 1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.https://www.penrealm.com/wp-admin/post.php?post=7435&action=edit#edit_timestamp
Simply unscrew the end cap, dip into ink, screw back the end cap, and your done! Ready to write!!
Pen cap has an inner cap to insure a perfect seal when stored away.
Made for the beginner who just wants to try out fountain pens, all the way to the experts. A good everyday worker.
Please note: Ink is NOT included
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?)
NOTE: If you choose to add a custom grind to your pen, this will add the time to when it will be shipped.
Comes in EF, F, M, B, Stub 1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.https://www.penrealm.com/wp-admin/post.php?post=7435&action=edit#edit_timestamp
Simply unscrew the end cap, dip into ink, screw back the end cap, and your done! Ready to write!!
Pen cap has an inner cap to insure a perfect seal when stored away.
Made for the beginner who just wants to try out fountain pens, all the way to the experts. A good everyday worker.
Please note: Ink is NOT included
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?)