TWSBI ECO Series Piston-Filler Fountain Pen – Sky Blue Demonstrator

Experience the perfect marriage of modern engineering and classic writing performance with the TWSBI ECO Series. Known for its "Economical" approach to high-end fountain pen features, the ECO is a favorite among students, business professionals, and calligraphy enthusiasts. This Sky Blue edition brings a refreshing, vibrant aesthetic to your desk, combining a crystal-clear demonstrator body with precision-crafted accents.

Key Benefits

Integrated Piston Filling System:** Move beyond the limitations of disposable cartridges. The ECO features a built-in piston mechanism that allows you to draw ink directly from the bottle. This system offers a significantly higher ink capacity, ensuring you can write for pages on end without needing a refill.

Precision German-Engineered Nib:** Each pen is equipped with a high-quality German stainless steel nib. Designed for durability and corrosion resistance, it provides a consistent, smooth ink flow that makes every stroke effortless, whether you are taking quick notes or practicing formal script.

Transparent Demonstrator Design:** The clear resin barrel allows you to see the inner workings of the piston and the swirling colors of your ink. It is both a visual masterpiece and a practical tool, as you can monitor your ink levels at a glance.

Secure Seal Technology:** The cap is designed with an internal seal to ensure the nib stays moist. This prevents the ink from drying out even if the pen is left unused for several days, so it is always ready to write the moment it touches paper.

Ergonomic and Roll-Resistant:** The cap features a subtle hexagonal shape that prevents the pen from rolling off flat surfaces, protecting the nib from accidental drops.

Key Specs

Filling Mechanism:** Integrated Piston Filler (no disassembly required for ink loading).

Nib Material:** High-hardness, corrosion-resistant German stainless steel.

Body Material:** Industrial-grade transparent resin with Sky Blue accents.

Design Style:** Demonstrator (transparent barrel).

How to Use

1. **Prepare for Filling:** Rotate the end knob at the back of the pen to move the internal piston toward the nib.

2. **Submerge the Nib:** Place the nib completely into a bottle of fountain pen ink.

3. **Draw the Ink:** Rotate the end knob in the opposite direction. This creates a vacuum that pulls the ink directly into the large reservoir barrel.

4. **Clean Up:** Once the barrel is full, remove the nib from the bottle and wipe away any excess ink from the grip and nib with a soft tissue or cloth.

Care & Safety

Storage:** Always store the pen with the cap firmly attached to maintain ink flow and protect the stainless steel nib.

Cleaning:** To maintain performance, flush the pen with room-temperature water when changing ink colors or if the pen will be stored for an extended period.

Ink Compatibility:** Use only bottled ink specifically formulated for fountain pens. Avoid using India inks or calligraphy inks meant for dip pens, as these can clog the internal feed.

Notes

The TWSBI ECO is celebrated for its "德系不锈钢笔尖" (German-engineered stainless steel nib), providing a professional writing experience at an accessible level.