TekMall Compatible Ink Cartridge Replacement for HP 970XL 971XL 970 971 for Officejet Pro X476dw X576dw X451dn X451dw X476dn X551dw Printers 4 Pack One Year Worry-free Warranty : 100% customer Satisfaction.Any errors such as "damaged cartridges", most probably caused by firmware update by HP,please contact us firstly for support by Click blue text "TEKMALL" below the price of listing,then click "Ask a question" highlighted in Orange on the Top right of the next page to contact us or by log in your Amazon Buyer Account &gt; Your Account &gt; Your Order &gt; Contact Seller. We would give you supports immediately, thank you for your time. Package Including : 1 * Black hp 970XL, 1 * Cyan 971XL, 1 * Magenta 971XL, 1 * Yellow 971XL(Non-oem) Page Yield (Approx.): ~9200 pages for Black 970XL ink and ~6600 pages for Color 971XL ink. Ink Features : Sharp and Clear Printout, High Quality, High Yield, Quick Dry, Long Lasting. Compatible with: hp X451dn X451dw X476dw X476dn X551dw X576dw Printers.