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With the HP 934XL Cartridges Black Duo Pack, you¿ll have a small supply of black ink for your HP OfficeJet Pro printer. This set includes 2 black XL cartridges. You can print up to 1,000 pages in black with 1 cartridge. Check below to see which printers this ink cartridge is suitable for: Suitable printers HP OfficeJet Pro HP OfficeJet Pro 6230 HP OfficeJet Pro 6800 HP OfficeJet Pro 6820 HP OfficeJet Pro 6830 Suitable for HP Instant Ink HP Instant Ink is a print plan that lets you print a fixed number of pages per month. You can cancel this plan every month, so you¿re not tied down to anything. Your HP printer sends a notification to HP when the ink is almost empty. Then you¿ll automatically receive a cartridge that¿s suitable for your HP printer.