The pack contains 25 black international sized ink cartridges which are non-waterproof. Apart from the Manuscript Fountain pens, these cartridges are also compatible with other brands.
Fine nib - 0.85mm,
Medium nib - 1.1mm,
2B nib - 1.6mm
The Manuscript Beginner's Calligraphy set (3 nibs - Fine / Medium / 2B)