Kingway 1 Set Replacement for HP 934XL 935XL Ink Cartridge (Latest Version Chips) for HP OfficeJet Pro 6830 6230 6815 6835 6812 6820 Printer Kingway Advantage: Good price, good quality. Customer Service: Any problems under normal circumstance, request for return or refund is acceptable. Please find your order and click 'Contact Seller', send us email and we will give you a good solution in 24 hours. Compatible for Printer: HP OfficeJet Pro 6830 6230 6835 6815 6812 6820 Inkjet Printer. Package Includes: 4 Pack Replacement for HP 934XL 935XL Ink Cartridge (1 Black, 1 Cyan, 1 Magenta,1 Yellow). Page Yield: Black: up to 1,000 Pages at 5% coverage; Cyan/Magenta/Yellow: up to 825 Pages at 5% coverage.