Ink cartridge code: 950XL 951XL ink cartridge Package includes: [4 packs] 1x black | 1x cyan | 1x magenta | 1x yellow Page Yield: Each 950XL black ink cartridge can hold 2300 pages; each 951XL color ink cartridge 1500 pages Printer compatibility: HP OfficeJet Pro 8600 8100 8610 8620 8660 8630 8640 8615 8625 251DW 276DW 271DW printers Note: 1. Please confirm your printer model before placing an order. 2. When in use, slowly remove the yellow sealing tape from the ink cartridge without removing other labels. 3. Please avoid touching the chip. 4. If the word "non-original" appears on the computer, click "OK" successively, and the printer can continue printing. 5. If your printer does not recognize the ink cartridge, remove the ink cartridge and reinstall it three times. Customer service: 1. If you have any questions, please feel free to contact us via email. 2. We hope everyone has a good shopping experience for this product, we will do our best to provide you with further assistance, thank you for your attention, and hope that our products will leave a good impression on you.