The twelve colours of the Chromatics collection are available in convenient small ink cartridges, compatible with all Caran d'Ache fountain pens.A prism of Cosmic Black ink, absolute and unfathomable, that reveals the inspiration and character of a beautiful pen.Technical Details:- Box size: 4.5cm x 5.2cm- 6 Chromatics ink cartridges per box- Cartridges branded with Caran d'Ache logo and colour's name- 12 Cromatics colours