Page Yield: EP T812XL Black Cyan Magenta Yellow is 1100 pages per cartridge (At 5% coverage on A4 paper). Features: High Yield, Vivid Color, Non-clogging nozzle. Certificate: ISO9001, Reach, and RoHS Certified. Package Included: 2x 21ml Black EP T812XL Ink Cartridge 1 x 18ml Cyan EP T812XLInk Cartridge 1 x 18ml Magenta EP T812XL Ink Cartridge 1 x 18ml Yellow EP T812XL Ink Cartridge High Yield: Up to 1100 pages per GreenArk EP T812XL Black Cyan Magenta Yellow ink cartridge. (At 5% coverage on A4 paper) EP 812XXL Ink Cartridge Compatible for Printer Models: WorkForce Pro WF-3820 WorkForce ProWF-3825 WorkForce ProWF-4830 WorkForce Pro WF-4835 WorkForce Pro WF-7830 WorkForce Pro WF-7840 WorkForce Pro WF-7845 Installation Steps: Step 1: Open the package, Take out the ink cartridge. Step 2: Remove the orange protective plastic cap carefully. (Don’t touch the chip on the cartridge) Step 3: Place the ink cartridge of the corresponding color into the corresponding printer card slot. Our Advantage: 1. These cartridges are compatible with many Epson printers. You can use these cartridges for Epson WorkForce EC-C7000, WorkForce Pro WF-7820, WF-7840 printers. 2. Tightly packed, multilayer shockproof device package, not easy to damage the product in the process of transportation. 3. Precautions for use: Avoid storing in a place exposed to high temperature, and direct sunlight.