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Description
Dark trim, big ink capacity: the TWSBI Eco Fountain Pen in Cosmos Blue Onyx pairs a muted, dusty grey-blue with a clear barrel and matte black onyx trim.
Key highlights
- Brand: TWSBI (Taiwan)
- Model: Eco
- Colour: Cosmos Blue Onyx
- Trim: onyx (matte black)
- Filling: piston, about 1.7ml
- Nib: steel, EF to 1.1 stub
The Onyx look
On Onyx editions such as the TWSBI Eco Cosmos Blue Onyx, TWSBI blacks out the metal parts: the clip, the centre band, the ring by the piston knob and the nib itself. That dark trim frames the Cosmos Blue cap and the clear barrel.
A piston filler
The TWSBI Eco Cosmos Blue Onyx fills straight from a bottle with its built-in piston and holds about 1.7ml, nearly twice a typical converter. The clear barrel of the TWSBI Eco Cosmos Blue Onyx shows exactly how much ink is left.
Easy to maintain
TWSBI designs the Eco to be taken apart for cleaning, and the TWSBI Eco Cosmos Blue Onyx comes with a wrench and silicone grease for the piston.
Frequently asked questions
Does the TWSBI Eco Cosmos Blue Onyx take cartridges?
No, the TWSBI Eco Cosmos Blue Onyx is a piston filler for bottled ink.
Which nibs are available for the TWSBI Eco Cosmos Blue Onyx?
The TWSBI Eco Cosmos Blue Onyx comes in Extra Fine, Fine, Medium, Broad and a 1.1mm stub, all black-coated steel.
What does Onyx mean on the TWSBI Eco Cosmos Blue Onyx?
Blacked-out trim and a black nib.
TWSBI Eco Cosmos Blue Onyx: specifications
- Brand: TWSBI
- Model: Eco
- Colour: Cosmos Blue Onyx
- Body: resin, clear barrel
- Trim: onyx (black)
- Cap: screw-on, postable
- Nib: steel, black coated
- Nib sizes: Extra Fine, Fine, Medium, Broad, Stub 1.1
- Filling: piston
- Ink capacity: approx. 1.7ml
- Length: 139mm capped, 167.5mm posted
- Diameter: 12.8mm
- Weight: 21g
- Origin: Taiwan
Buying from Makoba: what you get
- Delivered worldwide: 50,000+ pens safely delivered across India and the world
- 100% genuine: Every product is 100% genuine, with the official brand warranty where applicable
- Packed with care: Secure, protective packing for every pen and bottle of ink
- Everything for writing: One destination for pens, inks, paper and desk accessories
- Largest pen store: Makoba holds India's largest collection of pens, from everyday writers to rare limited editions
- Brand leader: Makoba is India's leading destination for TWSBI, and its largest seller
- 90+ brands: 90+ world-class brands, carefully selected for writers and collectors
- Trusted by collectors: 50,000+ collectors, from first-time buyers to seasoned enthusiasts, shop with us
Technical Specification
Title
Twsbi Eco Fountain Pen - Cosmos Blue Onyx
Brand
TWSBI
Collection
Eco
Product Origin
Taiwan
Product Type
Fountain Pen
Nib Material
Steel
Nib Size
Extra Fine, Fine, Medium, Broad, Stub 1.1
Trim
Black Trim
Colour
Blue & Clear
Cap & Barrel
Resin
Cap Mechanism How to remove the cap of the pen when its closed.
Screw-cap
Ink Capacity - Converter
1.80ml
Ink Filling Mechanism
Piston Filler
Diameter
12.8mm
Postable Can the cap be put on the back of the pen to make it longer.
Yes
Length When Closed
139mm
Length When Posted
167.5mm
Weight of Cap
8g
Weight of Barrel
13g
Total Weight The total weight of the pen including the cap and barrel. The pen is not filled with ink when measuring this.
21g
Warranty
As per International warranty guidelines provided by TWSBI Taiwan
Packaging
Original brand packaging with International warranty card
Customer Reviews
FAQ’s
Wondering what is our return / refund policy?
We do accept returns and refunds. Here are a few things to keep in mind:
- Product has to be in an unused condition with all its tags, warranty certificates and user manuals (if any) in tact.
- Return request is raised within 3 days of receipt of product.
- Consumables like inks, refills and paper products cannot be returned or exchanged.
- For more information on returns and (or) refunds, check out our return / refund policy.
When are orders shipped?
Every order creates an adrenaline rush in our team so any order received before 1PM will usually be shipped on the same day itself. However, due to unforeseen circumstances if we are not able to get your ready, rest assured we will ship it the next day. For more information on shipping, check out our shipping policy section.
Fretting for an online purchase?
We do not consider ourselves as a sales store, but more like your personal consultants.
- Our team is always ready to guide you through your journey at Makoba - whether that is online or in store.
- We have five stores in Chennai, Delhi, Ahmedabad, Gurgaon and Bangalore. Our specialists can guide you online or in store.
- Visit the Our Store page, find your nearest store and connect with us immediately
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Your great idea is just waiting to be put on paper. Put that piece of writing instrument into motion and see its magic.
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