Page Yield: Rated for approximately 12,500 pages per cartridge (37,500 pages total across the 3-pack), based on 5% coverage (ISO/IEC standard). Package Contents: Includes 3 black compatible CE255X (55X) high-yield toner cartridges. Printer Compatibility: Designed for HP LaserJet P3010, P3015, P3015d, P3015dn, P3015n, P3015x, LaserJet Enterprise 500 MFP M525dn, 500 MFP M525f, Enterprise Flow MFP M525c, LaserJet Pro M521dn MFP, and LaserJet Pro MFP M521dw printers purchased in the United States. Newly Built, Professionally Manufactured: Made by LD Products as a new compatible cartridge, not a remanufactured part. Using compatible replacement supplies does not void your printer's warranty. Not an OEM Product: This is a compatible replacement manufactured by LD Products and is not affiliated with, sponsored by, or endorsed by HP Inc. HP is a registered trademark of HP Inc., used here only to indicate compatibility. LD Products' compatible toner cartridges are a cost-effective alternative to OEM HP 55X (CE255X) cartridges, built for U.S. office environments. This 3-pack of black cartridges is designed to work with HP LaserJet P3010, P3015, P3015d, P3015dn, P3015n, P3015x, LaserJet Enterprise 500 MFP M525dn, 500 MFP M525f, Enterprise Flow MFP M525c, LaserJet Pro M521dn MFP, and LaserJet Pro MFP M521dw printers purchased in the United States, with an average yield of approximately 12,500 pages per cartridge (37,500 pages total across the 3-pack), based on 5% coverage (ISO/IEC standard). Each cartridge is newly built and professionally manufactured by LD Products, it is not a remanufactured part and quality-tested before shipping. Using compatible replacement supplies does not void your printer's manufacturer warranty. Intended for use only with printers purchased and used within the United States. LD Products is not affiliated with, sponsored by, or endorsed by HP Inc. HP is a registered trademark of HP Inc., referenced here only to indicate compatibility.