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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 strikes—ensuring clean, consistent writing from start to finish.
Product Features of TWSBI Eco Fountain Pen – Cosmo – Onyx Trim:
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Transparent resin demonstrator body
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Cosmo glow cap + finial for a luminous accent
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Onyx-black trim and black-plated steel nib
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Piston-filling system with generous 1.76ml capacity
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Screw-cap with inner seal to prevent ink dry-out
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Available nib sizes: EF, F, M, B, 1.1 Stub
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Lightweight, comfortable resin grip
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Postable design for balanced writing
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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 performance—ideal 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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