TWSBI
TWSBI ECO Cosmos Blue with Onyx Fountain Pen M
₹ 8,415.00
₹ 9,350.00
10% Off
Available Color
Select size
SKU: M7445520 · In Stock
TWSBI ECO Cosmos Blue with Onyx Fountain Pen M
TWSBI ECO Cosmos Blue with Onyx – Fountain Pen
The TWSBI ECO Cosmos Blue with Onyx is a striking evolution of one of the most beloved modern piston-fill fountain pens. Combining TWSBI’s signature engineering with an arresting palette inspired by celestial beauty, this edition stands out as both an everyday writing companion and a display-worthy collectible.
A Celestial Colorway
The Cosmos Blue resin captures the depth and mystery of a starlit sky. Its smooth, semi-translucent body shifts subtly with the light, giving the pen a sense of motion even at rest. Complementing this is the Onyx trim—sleek, dark, and polished—adding contrast and sophistication without overpowering the pen’s luminous blue presence. The result is a harmonious, modern aesthetic that feels both bold and refined.
Engineered for Reliability
Like every ECO model, this pen is built around TWSBI’s robust piston-filling mechanism, designed for large ink capacity and long-term durability. The clear ink chamber allows you to monitor your ink level at a glance, turning every fill into a visually satisfying moment. Stainless steel components and a precise sealing system ensure smooth operation and a long service life, living up to TWSBI’s reputation for accessible yet high-performance engineering.
Smooth Writing Performance
Outfitted with a polished stainless steel nib, the pen delivers crisp, controlled lines with gentle feedback that many writers find reassuringly tactile. It excels in:
-
Detailed handwriting
-
Compact note-taking
-
Precise sketching or technical work
-
Everyday writing where clarity matters
Whether on smooth premium paper or standard notebooks, the nib offers a consistent, reliable flow without sacrificing finesse.
Comfort Meets Practicality
The ECO’s lightweight construction makes it comfortable for long writing sessions, while its hexagonal cap prevents it from rolling off desks. The screw-on cap offers secure closure and contributes to excellent drying resistance, supporting dependable performance during daily use.
A Pen Designed to Be Used
The TWSBI ECO Cosmos Blue with Onyx isn’t just visually stunning—it’s made for constant use. Easy to disassemble for cleaning, equipped with a generous ink capacity, and engineered for long-term reliability, it appeals to both newcomers to fountain pens and seasoned collectors who appreciate functional beauty.
Product Information
TWSBI ECO Cosmos Blue with Onyx Fountain Pen
Model / Edition
TWSBI ECO “Cosmos Blue with Onyx,” also known in some regions as “Slate Blue Onyx.”
Nib Size
This model is offered in multiple nib sizes, such as Fine, Medium, Broad, and 1.1 mm Stub.
Nib Material
Stainless steel with matching onyx-colored trim.
Filling Mechanism
Piston-filling system designed for use with bottled ink.
Ink Capacity
Approximately 1.76–1.80 ml, providing an excellent reservoir for extended writing sessions.
Body Material
Resin body with a transparent, demonstrator-style barrel and onyx-black trim and clip.
Cap Type
Threaded screw-cap with an inner seal to help prevent ink from drying out.
Postable Cap
Cap can be posted securely onto the back of the pen while writing.
Dimensions / Weight
-
Length (capped): ~139 mm
-
Length (posted): ~167–168 mm
-
Weight (empty): ~20–21 g
-
Cap: ~8 g
-
Barrel: ~12–13 g
-
Packaging & Maintenance Kit
Includes a small wrench and silicone grease for maintenance and disassembly, allowing for long-term care.
Design & Use-Case Details
Transparent Barrel
The “Cosmos Blue with Onyx” features a translucent barrel that allows the ink supply to be visible—ideal for note-takers, journalers, and sketchers.
Aesthetic Look
The deep cosmic-blue body paired with onyx-black trim creates a refined, modern look that blends demonstrator styling with minimalistic elegance.
Everyday & Extensive Writing
Generous ink capacity and the piston system make it well-suited for:
-
Journaling and daily writing
-
Academic or office work
-
Letters and creative writing
-
Sketching or drawing (with suitable ink and paper)
Comfort & Maintenance
Lightweight and well-balanced for long writing sessions. The ability to disassemble the pen makes cleaning simple and keeps performance consistent.
What to Know / What to Expect
Ink Usage
This model uses bottled ink only; cartridges or converters are not used with this filling system.
Maintenance
Occasional cleaning and lubrication are recommended, especially when changing ink colors. The included wrench and grease support easy upkeep.
Writing Feel
The stainless steel nib offers controlled, precise lines. Writing performance may vary based on ink choice, paper quality, and writing pressure.
0 Reviews for TWSBI ECO Cosmos Blue with Onyx Fountain Pen M
