Do it Wiser Compatible Ink Cartridge Replacement for HP 935 XL 934 XL 934XL 935XL Officejet Pro 6830 6230 6835 6812 6815 6820 (Black Cyan Magenta Yellow, 4-Pack) Black Cyan Magenta Yellow high yield 1,000 Pages at 5% Coverage Compatible Ink Cartridge with HP OfficeJet 6820, 6815, 6810, 6812 eAIO | HP Officejet 6220 | HP Officejet Pro 6230 ePrinter | HP Officejet Pro 6835, 6830 eAIO Do it Wiser Smart Ink Cartridges are covered by 1 year warranty against defects 30 days unconditional money back guarantee and free no hassle returns. We will refund your payment after receiving your returned package. Shipping charges are not refundable. Cartridges certified to work | ISO 9001 quality assurance | ISO 14001 environmental management | RoHS Lead Free 1 Black 1,000 pages 1 Cyan 825 Pages 1 Magenta 825 Pages 1 Yellow 825 Pages OfficeJet 6812 OfficeJet 6815 OfficeJet 6230 OfficeJet Pro 6830 OfficeJet Pro 6835 934XL 935XL