TWSBI

There is not one pen that has the same exact color accent as another; every pen will be similar in color accents but all slightly different due to the nature of this finish.

Custom Nib Grinds are available!

Would you like a custom grind on your new pen? Scroll down to the "You may also like..." section below and choose Custom Nib Grind. Pick your grind and add it to the cart along with this pen.

Now with even more consistent ink flow when valve is opened.

Simply pull up, push down and your ink is filled, ready to go.

Vacuum filler type fountain pen.

Also designed with a ink shut off valve for easy carry and no spill mess

Comes in EF, F, M, B, Stub1.1, Stub1.5 nib sizes (please choose one)

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?)

 

Here is a review by Doodlebud which includes disassembly tips - https://www.youtube.com/watch?v=qtaWEFkS7kA

Comes in EF, F, M, B, Stub1.1 nib choices.
Pen cap is able to post onto the back of the pen.

Piston Filler Fountain pen.
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 ensure 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?)

Custom Nib Grinds are available!

Would you like a custom grind on your new pen? Scroll down to the "You may also like..." section below and choose Custom Nib Grind. Pick your grind and add it to the cart along with this pen.

Aluminum machined grip, connector, and piston rod. 
Features

Improved grip and end barrel section compared to 540

580 has increased ink capacity, about 30% more than 530

580 has improved the smoothness of cap thread turning

580 shows you our promise on continuous product improvement on small details

Please note : ink is not included

The idea behind the TWSBI Diamond 530, 540, and 580 was to go back to basics and capture the simplicity and elegance of traditional writing instruments. In recent years, the development and modernization of writing instruments has resulted in traditional writing instruments, such as fountain pens, falling into obscurity. It was our goal to bring the past back to life by creating a traditional fountain pen that even modern day society can appreciate.

TWSBI Diamond 580, a classic fountain pen with a piston ink-filling system. By fusing the traditional mechanisms of the fountain pen with a modern industrial design, we have created an eye-catching fountain pen that is simultaneously appreciative of the past and relevant in the present. The Diamond 580 comes with a benchmark ink-filling mechanism and has all detachable parts. We felt that it was important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen.

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?

RELEASE DATE APRIL 1, 2020
Comes in EF, F, M, B, Stub1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.
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?)

Comes in EF, F, M, B, Stub1.1 nib choices.
Pen cap is able to post onto the back of the pen.

Piston Filler Fountain pen.
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?)

TWSBI ECO WHITE ROSE GOLD FOUNTAIN PEN Custom Nib Grinds are available!
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, Stub1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.
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?)

Comes in EF, F, M, B, Stub1.1 nib choices.
Pen cap is able to post onto the back of the pen.

Piston Filler Fountain pen.
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?)

TWSBI ECO SMOKE ROSE GOLD FOUNTAIN PEN Custom Nib Grinds are available!
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, Stub1.1 nib choices
Pen cap is able to post onto the back of the pen
Piston Filler Fountain pen.
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?)

Release Date: October 29, 2025

Comes in EF, F, M, B, Stub1.1 nib choices.
Pen cap is able to post onto the back of the pen.

Piston Filler Fountain pen.
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?)