The HP no. 11 colour ink cartridges work as a modular system with HP no. 10 black ink cartridges and HP no. 11 printheads. Each ink cartridge includes a ""smart chip"" that optimizes print quality and automatically warns when ink is low. The HP no. 11 colour ink cartridges provide laser-quality black print and photo-perfect colour on high-quality paper. Page yield: 1,750 pages based on 15 % average coverage.