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59 products
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
Onyx trim color
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The Black Marble color features a new coloring technique in the injection molding process to create unique patterns and colors. Every single pen will be unique.
Bronze trim color
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The Carrara color features a new coloring technique in the injection molding process to create unique patterns and colors. Every single pen will be unique.
Onyx trim color
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Mini fountain pen delivers the trusted performance of TWSBI’s piston-filling system in a compact, travel-friendly design. Small in size but big on functionality, the Mini is perfect for writers who want the ink capacity and engineering of a full-sized fountain pen in an easy everyday carry.
Fitted with a polished stainless steel nib engraved with the TWSBI logo, the Mini is available in a wide range of nib sizes and the reliable piston-filling mechanism allows you to fill directly from bottled ink, offering generous ink capacity without the need for cartridges.
Despite its compact size, the TWSBI Mini is designed for comfort. The barrel is threaded so the cap can securely post on the back of the pen, creating a balanced writing length that feels natural in hand.
Size & Specifications
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Length: 117mm closed, 108mm open, 140mm posted
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Max barrel diameter: 12.4mm (grip tapers to 9.8mm)
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Weight: 18g
For perspective, the Mini is about an inch shorter than the Diamond 580.
Rose gold trim color
The TWSBI Vac700 fountain pen combines bold demonstrator styling with an innovative vacuum filling system designed for impressive ink capacity and smooth, consistent performance. With its clear barrel and substantial size, the Vac700 showcases both your ink and the fascinating mechanics inside, making it a standout choice for everyday writing or desk use.
Filling the pen is simple: just pull the plunger up, push it down, and the vacuum mechanism quickly draws ink into the barrel. The Vac700 now features even more consistent ink flow when the valve is opened, ensuring a reliable writing experience across long sessions.
An integrated ink shut-off valve allows you to seal the ink chamber for safe transport, helping prevent leaks and making the pen easy to carry without worry.
Anodized finish
Here is a review by Doodlebud which includes disassembly tips - https://www.youtube.com/watch?v=qtaWEFkS7kA
The TWSBI Diamond 580 fountain pen blends modern engineering with classic demonstrator style, making it one of the most beloved pens in the TWSBI lineup. Crafted with a faceted, diamond-cut barrel, the 580 beautifully showcases your ink while providing a comfortable, balanced writing experience for everyday use.
Built with TWSBI’s signature piston-filling mechanism, the Diamond 580 offers a generous ink capacity and smooth, consistent flow. The transparent body allows you to monitor ink levels at a glance, while the precision-engineered stainless steel nib delivers a reliable and customizable writing experience. Designed to be user-serviceable, the 580 can be easily disassembled for cleaning and maintenance—perfect for fountain pen enthusiasts who love to tinker.
Aluminum machined grip, connector, and piston rod.
AL Models have a smooth grip section.
ALR Models have a ribbed textured grip section.