TWSBI Eco Fountain Pen in Transparent Yellow

Size: Extra Fine
₹. 5,750
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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.