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TWSBI Eco Fountain Pen - Cosmo -  Onyx Trim

TWSBI Eco Fountain Pen – Cosmo – Onyx Trim

Watch Instagram Story IA Radiant Twist on a Beloved Everyday WriterThe TWSBI Eco Cosmo elevates the classic Eco silhouette with a playful, luminous charm. Its crystal-clear resin barrel beautifully showcases your ink as it moves, while the Cosmo blue cap a

$29.50 $58.99
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Watch Instagram Story I

A Radiant Twist on a Beloved Everyday Writer

The TWSBI Eco Cosmo elevates the classic Eco silhouette with a playful, luminous charm. Its crystal-clear resin barrel beautifully showcases your ink as it moves, while the Cosmo blue cap and finial softly glow to create a subtle cosmic effect in low light. Paired with a sleek onyx trim and a smooth-performing steel nib, this pen blends durability, style, and everyday practicality in one thoughtful design.

The piston-filling mechanism offers impressive ink capacity, and the inner-cap seal keeps the nib ready whenever inspiration strikesensuring clean, consistent writing from start to finish.

Product Features of TWSBI Eco Fountain Pen – Cosmo – Onyx Trim:

  • Transparent resin demonstrator body

  • Cosmo glow cap + finial for a luminous accent

  • Onyx-black trim and black-plated steel nib

  • Piston-filling system with generous 1.76ml capacity

  • Screw-cap with inner seal to prevent ink dry-out

  • Available nib sizes: EF, F, M, B, 1.1 Stub

  • Lightweight, comfortable resin grip

  • Postable design for balanced writing

  • Includes wrench & silicone grease for long-term care

Why Choose this TWSBI Eco Fountain Pen – Cosmo – Onyx Trim?

The ECO Cosmo combines affordability with premium performanceideal for beginners building their first collection and enthusiasts who appreciate reliability with a touch of fun. Its glow elements make it unique, while the transparent barrel and piston system offer a hands-on, immersive fountain pen experience.

Due to the nature of the material, there will be some variation in the pattern seen here. We cannot honor special requests.

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Shipping Methods & Rates
We offer a variety of shipping options to meet your needs. The cost of shipping depends on the shipping method you choose, the destination, and the size of your order. Please refer to the shipping options available at checkout for more details.

Express Shipping: Delivery within 3-5 business days (next-day delivery for some locations).
International Shipping: Available to selected countries. Delivery time and shipping fees will vary based on destination.
Processing Time
Orders are typically processed within 1-2 business days from the time your order is placed. Please note that during peak seasons or promotional periods, processing time may be slightly longer.

Tracking Your Order
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Domestic Orders: Typically arrive within 3 business days.
International Orders: Delivery times may range from 7 business days, depending on the destination country and customs clearance times.

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