Sei-Boku Ink cartridges - Sailor - Blue 12 pcs

Sei-Boku ink cartridges by Sailor Pen Company contain a high-quality pigment ink made with exceptionally fine particles.

Thanks to this technology, the ink is designed to minimise the risk of clogging while delivering a smooth writing experience similar to dye-based inks. The result is consistent ink flow, reliable performance, and excellent everyday usability.

Sei-Boku stands out with its deep blue color and strong performance on paper—offering minimal bleed-through and feathering. This makes it suitable for both illustration and more formal applications, such as official documents. It is an ideal choice for those seeking a durable yet easy-to-use pigment ink. Sailor cartridges are proprietary and compatible only with Sailor fountain pens.

Sailor Pen Company is built on a philosophy that blends tradition, craftsmanship, and modern innovation. With over 100 years of history, the brand is dedicated to cultivating the culture of handwriting and creating tools that unite function with beauty. Its core idea is to design products that not only write, but also inspire and bring joy to the creative process. The company manufactures its pens in Japan, where it is renowned for traditional craftsmanship and meticulous quality control.

At the heart of the brand’s philosophy are three pillars: authenticity (creating refined, genuine products), technology and craftsmanship (precision developed over decades), and beauty (an aesthetic rooted in Japanese sensibility). Sailor is considered a pioneer in the world of writing — continuously evolving its technology while preserving tradition, and striving to create functional beauty that engages the senses