RIGHTINK Remanufactured Ink Cartridges for HP 934XL 935XL 4Pack(BK/ C/ M /Y)Compatible With HP OfficeJet 6812 6815 Printers Package Lists :1x 934XL Black , 1 x 935XL Cyan, 1x 935XL Magenta, 1x 935XL Yellow Page yield (Black) : 1000 pages per cartridge, at 5% coverage, 825 pages per cartridge, at 5% coverage. Type:Remanufactured Ink Cartridges (Not made by HP) Compatible With - HP Officejet 6812 e-All-in-One Printer - HP Officejet Pro 6830 e-All-in-One Printer - HP Officejet 6815 e-All-in-One Printer - HP Officejet Pro 6835 e-All-in-One Printer - HP Officejet Pro 6230 ePrinter Good after-sales service an all products covered by a 100% satisfaction guarantee and 90 days warranty