Package Contents: Includes 2 Pack W1380X black toner cartridges, specifically designed as replacements for HP 138X Black Toner Cartridges. High Yield: Each 138X black toner cartridge offers a page yield of up to 4,000 pages, based on 5% coverage. Broad Compatibility: Compatible with a wide range of HP Laser jet Pro 3001dw Laser jet Pro 3001fdw Laser jet Pro MFP 3101fdw series. Advanced Chips: Features upgraded chips to ensure high compatibility and seamless integration with specified HP printer models. Easy Installation: Each toner cartridge is individually sealed and designed for straightforward installation. Rigorous Testing: Cartridges undergo thorough testing in a high-tech facility under strict quality control guidelines