TWSBI

TWSBI (pronounced “twizz-bee”) is a Taiwanese brand known for creating piston- and vacuum-filled fountain pens that combine high ink capacity, smooth writing, and exceptional value. While the company has over 50 years of experience as a precision manufacturer, it launched its own brand to bring durable, well-engineered pens directly to writers.

Most TWSBI pens feature clear demonstrator bodies, allowing you to see your ink levels, and come with tools and silicone grease for easy maintenance — a rare feature in today’s fountain pen market. Their pens are built for everyday use with stainless steel nibs in a wide range of sizes, from extra fine to stub, ensuring a comfortable writing experience for beginners and enthusiasts alike.

Popular models include the entry-level ECO, the flagship Diamond 580, and the Vac700R with a unique vacuum-filling system. TWSBI also offers inks, oversized cartridges, and inkwells designed to pair perfectly with their pens.

For anyone seeking a reliable, high-capacity pen with innovative engineering at an accessible price, TWSBI stands out as a go-to choice.