Produce professional-quality colour documents at a better value for frequent printing with HP 935XL ink cartridges. They'll deliver consistently durable prints that resist water and last for decades. HP XL High Yield inks can help you save up to 40% per page compared to standard single inks. These XL cartridges will print up to 825 A4 pages. Compatible with: Officejet: 6820, Pro 6830