Sold as 4/Pack Package Contents: Totally 4 Pack for HP 923 Ink Cartridges, Includes 1 x 923 Black Ink Cartridges, 1 x 923 Cyan Ink Cartridges, 1 x 923 Magenta Ink Cartridges, 1 x 923 Yellow Ink Cartridges, 1 x Chip Tool and 1 x User Guide High Page Yield: Up to 500 Pages per Black for HP 923 Ink Cartridges and 400 Pages per Cyan Magenta Yellow 923 Ink Cartridges for HP Printers (At 5% Coverage for A4 Paper) Compatible Printers: These for HP 923 Ink Cartridges Combo Pack Compatible for HP OfficeJet Pro 8135e 8138e 8139e 8130e 8134e 8132e OfficeJet 8120e 8122e 8124e 8125e Printers 📣⚠️Important Note: NO CHIPS! Wiseta for HP 923 Ink Cartridges are not Equipped with Chips, and You Need to Prepare and Install Chips to Drive Them. You Could Find the Instructions in Side Picture and Installation Video 📣⚠️Wiseta for HP 923 Ink Cartridges Chip Replacement Guide： ① Remove Original Chip: Detach the old chip from cartridge using the provided tool；② Install Replacement Chip: PEEL off the adhesive backing from the new compatible chip；Align the chip with cartridge contacts and PRESS FIRMLY to secure