Features 1、Latest Smart Chip Technology: The printer ink cartridge features upgraded smart chips that ensure compatibility with your printer, delivering excellent printing results. This advanced technology ensures seamless communicating with your printer for optimal performance. 2、Good Compatibility: The ink cartridges are compatible with for WorkForce Pro WF-7840, for WF-7820, for WF-7310, and for EC-C7000 printers, providing a good fit for your specific printer model. This compatibility guarantees an easy printing experience without any compatibility issues. 3、Big Page Yield: Each black ink cartridge can yield up to 1100 pages, while each color ink cartridge can yield up to 1110 pages, ensuring long lasting performance and efficiency. The high page yield of these ink cartridge replacements allows for fewer replacements and more economical printing. 4、Multiple Colors: The printer cartridge replacement set includes 1 black ink cartridge, 1 cyan ink cartridge, 1 magenta ink cartridge, and 1 yellow ink cartridge, providing a complete set of 4 colors ink cartridges for your printing needs. 5、Good Performance: By replacing your original cartridges, you can expect exceptional performance and excellent printing output. The remanufactured ink cartridge delivers slick and vibrant prints, ensuring professional looking results for all your printing tasks. Specification Item Type: Ink Cartridge Set Material: PP Color: BK, C, M, Y (Black, Cyan, Magenta, Yellow) Application: for Workforce Pro WF-7840, for WF-7820, for WF-7310, for EC-C7000 Printer Package List 4 x Ink Cartridges