Contents: 4 pack of Compatible Ink cartridges Replacement for Upgraded HP 950XL 951XL 950 XL 951 XL combo pack (1 Black, 1 Cyan, 1 Magenta, 1 Yellow) | Page Yield: Up to 2300 pages per black cartridge & 1500 pages per color cartridge at 5% coverage ( A4 paper size ) | Printer Compatibility: HP Officejet Pro 8100 8600, 8610, 8615, 8620, 8625, 8630, 8640, 8660, 251DW, 276DW, 271DW | Each 950XL 951XL ink cartridge undergoes a strict quality testing procedure to ensure compatibility with your printer and quality printout | NOTE: Reinstall the cartridgein the printer ( you need to remove and reinsert it 2-3 times ) if you get an error message