?Product Information Product Name : hp 934xl compatible ink cartridge product Include : 3 × 934XL Black Page Yield : Up To 1,200 Pages Each Black 934XL Ink Cartridges For HP Printers at 5% Coverage (Letter/A4) ?PRODUCT FEATURES: Good tightness: The ink cartridge is ultrasonically welded to ensure that the cartridge casing is sealed and ink leakage and color mixing do not occur. Strong compatibility: 100% compatible with the original ink, ensuring that the ink dots are always smooth, even and clear. Naturally bright colors: High-quality ink, ink particles less than 20 nanometers, smooth printing, restore true color. High capacity: The ink is filled in a large amount, the utilization rate is high, the ink capacity is sufficient, and the ink is smooth. ?Printer compatibility: Compatible with HP OfficeJet 6220 6800 6812 6815 6820 6822 6825 OfficeJet Pro 6230 6830 6835 6836 printers ?Tips: 1.Please confirm your Printer Model before placing an order. 2.To improve the printing quality, it’s better to clean the printhead before printing with a new cartridge. 3.When install the new cartridges into printer,the computer would promote "Non-Original", please click "Yes" ,then the printer can go on to print. 4.If there is any leakage of ink cartridges, please contact the seller in time for a full refund. ? You're welcome to contact seller firstly if any problems happen. We will respond to your question within 24 hours.?