Twsbi | Eco | Fountain Pen | - Slate Blue Onyx

TWSBI ECO Fountain Pen – Slate Blue Onyx

The TWSBI ECO Slate Blue Onyx is a stunning combination of modern minimalism and everyday utility, designed for fountain pen enthusiasts who seek performance, style, and value in one beautifully engineered writing instrument. This limited edition release features a smoky transparent barrel paired with deep slate blue cap and piston knob accents—evoking the elegance of onyx stone with a subtle, contemporary twist.

Crafted with precision and built for durability, the ECO features a smooth stainless steel nib (available in a variety of sizes) and a generous piston-filling mechanism that allows for a high ink capacity, making it perfect for long writing sessions. The clear barrel not only offers a visual ink window but also celebrates the mechanical beauty of the internal piston system.

With its screw-on cap and well-balanced feel, the ECO Slate Blue Onyx delivers a consistent, enjoyable writing experience for both beginners and seasoned pen users. Ideal for journaling, note-taking, or expressive writing, this pen pairs perfectly with your favorite bottled inks.

Specifications:

• Color: Slate Blue Onyx (Transparent barrel with slate blue accents)

• Nib: Stainless Steel (Available in EF, F, M, B, 1.1mm stub)

• Filling Mechanism: Piston-fill (bottled ink required)

• Ink Capacity: Approx. 1.76ml

• Body Material: Resin

• Cap: Screw-cap

• Posting: Cap posts securely on the back

• Dimensions (Capped): 139mm | Posted: 167mm | Weight: Approx. 20g

• Packaging: Includes wrench, silicone grease, and instructions for disassembly and maintenance

Shipping, Warranty & Refunds:

• Shipping: Securely packaged for safe delivery

• Warranty: Backed by TWSBI's limited warranty for manufacturing defects

• Refund Policy: 7 day return policy for unused items in original condition