Products

Replacement Nib Units for TWSBI Fountain Pen

• TWSBI 580

• TWSBI Mini

• TWSBI Vac Mini

Bigger 70ml bottle. Will come with a funnel for easy filling, so you can get every last drop. Black, Sapphire blue, Red, Blue Black colors.

The TWSBI Kai fountain pen is a striking Limited Edition release that blends refined color with elegant detailing. Featuring a rich blue pebbled body paired with rose gold trim and nib, the Kai offers a distinctive look that feels both modern and sophisticated.

Built with TWSBI’s trusted piston-filling system, the Kai allows you to fill directly from bottled ink while providing generous ink capacity for extended writing sessions. Its balanced design and comfortable grip make it ideal for everyday writing, journaling, or adding a touch of style to your desk.

The pen is fitted with a rose gold–plated stainless steel nib available in multiple sizes, delivering smooth, consistent ink flow and a reliable writing experience.

TWSBI Obsidian

Condition: 3. Very Good, has some scratches on the body

Nib: Medium Stub Stainless Steel (Bronze Colored)

Filling System: Piston

Specifications:

Closed: 141.8 mm

Open: 128.3 mm

Barrel: 14.9 mm

Section: 10.4 mm

The TWSBI Obsidian fountain pen is a striking Limited Edition release that pairs bold styling with the reliable performance TWSBI is known for. Finished in deep black tones reminiscent of polished volcanic glass, the Obsidian offers a sleek, modern look that stands out while maintaining an elegant simplicity.

Designed with TWSBI’s trusted piston-filling system, the pen allows you to fill directly from bottled ink while providing generous ink capacity for extended writing sessions. The balanced construction and comfortable grip make it well suited for everyday writing, journaling, or collecting.

Fitted with a smooth stainless steel nib available in a variety of sizes, the Obsidian delivers consistent ink flow and a dependable writing experience.

While the pen cap will physically fit onto the back of the pen body in a way that would be considered ‘posting’, TWSBI recommends NOT doing so to avoid potentially scratching the barrel.

The Obsidian color features a new coloring technique in the injection molding process to create unique patterns and colors. Every single pen will be unique.

TWSBI Piston Wrench

Metal - Works on 580's & Mini's

TWSBI Piston Wrench

Plastic - Works on Eco's & Eco-T's