FreeSUB 1 Set +1 Black High Yield Replacement For HP 934XL 935XL With New Generation Chips For HP Officejet Pro 6230 6815 6812 6830 6835 6820 printers Page Yield (approx): 1000 Pages per Black, 825 Pages per Color (Non-original) Fast Shipping, New generation chip, high quality ink, can compare with the original quality Contents: 5 Pack HP 934XL 935XL High Yield Ink Cartridges (2 Black, 1 Cyan, 1 Magenta, 1 Yellow) Compatible with: HP Officejet Pro 6230 6830 6815 6812 6835 6820All-in-One Printers If there are any product issues, simply contact us for refund or free replacement