ETI Office 2PK 934XL Black Ink Cartridge High Yield Compatible for HP OfficeJet Pro 6830 6820 6230 OfficeJet 6812 6815 6835 Printer (2xBlack) HP 934XL 935XL Ink Cartridges (Non-OEM) Come with Latest Chips,ensure that compatible with Latest printer Package include: 2x Black compatible HP 934XL 935XL ink cartridge Ink Volume: Black 58ML, Cyan/Magenta/Yellow 16ML per color. Page Yeild: 1000 pages for black cartridge, 825 pages for color cartridge. Compatible with: HP OfficeJet Pro 6820 HP OfficeJet Pro 6830 OfficeJet Pro 6230 OfficeJet 6812 OfficeJet 6815 OfficeJet 6835 Printer. ISO9001 and CE Certified,1-Year Warranty.100% Satisfaction.