SPEED&trade; HP 56 and HP 57 Remanufactured Ink Cartridge 1 Black (C6656AN) and 1 Color (C6657AN) 2 Pack for HP Series Printer HP 56 Black ink tank contains 20ml, yields up to 520 pages per cartridge @ 5% coverage. HP 57 Color ink tank contains 21ml, yields up to 500 pages per cartridge @ 5% coverage. Compatible Printers: DeskJet 450cbi, DeskJet 450ci, Deskjet 450wbt, Deskjet 5150, DeskJet 5550, Deskjet 5650, DeskJet 5850, DeskJet 9670, DeskJet 9680, OfficeJet 4110, Officejet 4215, Officejet 5505, Officejet 5510, OfficeJet 6110, Photosmart 2410, Photosmart 2510, PhotoSmart 7150, PhotoSmart 7260, PhotoSmart 7350, Photosmart 7450, PhotoSmart 7550, PhotoSmart 7660, PhotoSmart 7760, Photosmart 7960, PSC 1210, PSC 1311, PSC 1315, PSC 1350, PSC 2110, PSC 2175, PSC 2210. Print Effectiveness: Make printing smoother, natural looking images and fewer granularities, producing best looking prints ever. Inks stop to come out automatically when printing is over. Technology: SPEED ink cartridges are adopted the leading Print Head Cleaning Technology, Print Head Testing Machine Technology, Eco Friendly Technology, Zero-energy Technology. The cartridges underwent an extensive process including, cleaning, testing the chip, ink vacuum refilling, totally pass to 27 production lines. All cartridges reach the standard when they are tested in any severe environment. Warranty: CE, TUV, ROHS, ISO9001, ISO4001 International Quality Certified.