TWSBI Eco Fountain Pen in Transparent Yellow
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The TWSBI Eco Fountain Pen in Transparent Yellow combines a cheerful, eye-catching finish with genuinely practical design. The semi-transparent yellow resin body doubles as a demonstrator, giving full visibility of the ink level and the piston mechanism at work, so the pen is as engaging to look at as it is to write with.
A polished stainless steel nib — available in Extra Fine, Fine, Medium, Broad, and a 1.1 mm Stub — delivers smooth, consistent ink flow suited to everyday writing, journaling, note-taking, and creative scripts alike. The twist-action piston fill draws ink directly from a bottle and holds a generous 1.7–1.8 ml, supporting long writing sessions without frequent refills. A screw-on cap seals securely to keep ink from drying out and can be posted on the back of the pen for extra length and reach.
At roughly 21 g and with a gently tapered grip section, the Eco stays comfortable through extended writing. It's also fully disassemblable, so cleaning and long-term maintenance are straightforward — a design built to be used, taken apart, and reassembled for years of reliable service.
Key Features
- Semi-transparent yellow resin body — demonstrator style shows ink level and piston mechanism.
- Polished stainless steel nib, available in EF, F, M, B, and 1.1 mm Stub.
- Twist-action piston fill draws directly from bottled ink; ~1.7–1.8 ml capacity.
- Screw-on cap seals securely and can be posted for added length.
- Chrome trim and spring clip for refined detailing.
- Lightweight (~21 g) with a tapered grip section for comfortable long writing sessions.
- Fully disassemblable for easy cleaning and long-term maintenance.
| Brand | TWSBI |
| Model | Eco Fountain Pen |
| Colour | Transparent Yellow |
| Body Material | Semi-transparent resin |
| Trim | Chrome, spring clip |
| Style | Demonstrator |
| Nib Material | Polished Stainless Steel |
| Nib Sizes Available | EF, F, M, B, 1.1 mm Stub |
| Filling System | Twist-action piston fill |
| Ink Capacity | Approx. 1.7–1.8 ml |
| Length (Closed) | ~139 mm (5.45 in) |
| Length (Uncapped) | ~131 mm (5.18 in) |
| Length (Posted) | ~168 mm (6.6 in) |
| Diameter | ~12.8 mm |
| Weight | ~21 g |
Extra Fine and Fine suit small handwriting and dense notes, Medium works well for everyday writing, Broad gives bold, expressive lines, and the 1.1 mm Stub adds line variation for a calligraphic feel.
Twist the knob at the end of the barrel to lower the piston, dip the nib into a bottle of ink, then twist the other way to draw ink up into the pen — no cartridge or converter needed.
Yes. The screw-on cap can be posted securely on the back of the barrel, adding extra length for those who prefer a longer pen while writing.
Yes. The Eco is fully disassemblable, so the nib unit, barrel, and piston can be separated for cleaning, making long-term maintenance straightforward.
Its combination of affordability, generous ink capacity, and multiple nib sizes makes it a popular pick for students, professionals, and fountain pen enthusiasts alike, whether for daily writing, journaling, or creative work.
Barcode: -
Product Type: Fountain Pens
SKU: TOE-M2531770
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Weight: 100 g
Vendor: TWSBI