Keep a true black line in a Sailor fountain pen with Sailor Fountain Pen Ink Cartridge – Ultra Black. This is 極黒 (Kiwaguro): Sailor’s ultra-fine pigment black — not the standard dye cart.
The particles are small enough to write like dye, but the line resists water and show-through better than a typical washable black. Use it for notes, forms and drawings that should stay put. Pack of 12. Each cartridge is φ 6.5 × 49.5 mm and about 1.5 g. Sailor proprietary fit only.
Designed for everyday Sailor pens when you want archival-leaning black without switching to a bottle.
- Package size: 4.4 × 1.4 × 5.3 cm
- Diameter: 6.5 mm
- Set of 12 ink cartridges
- 1 ml capacity
- Made in Japan


【ABOUT THE BRAND】
The Sailor Pen Co., Ltd. was founded in 1911, a pioneer to produce domestic fountain pens in Japan. With over 110 years of devotion to technology and aesthetic design, Sailor has evolved the Japanese craftsmanship and has become a world leading fountain pen brand. Their wide range of high-quality writing instruments includes fountain pens, inks, dip pens, ballpoint pens, mechanical pencils, and markers.