Specification: CISS FOR HP Business inkjet 1000/1100/1200 series Cartridge model: 4 colors 4 cartridges: C4844A, C4836A, C4837A, C4838A Features: 1) Top rank in China market, professional manufacture. 2) Vivid and High quality output and high stability with low price. 3) Quick installation and simple to use. 4) No clogging, No leaking. 5) Inktank is thick and hard.