Page Yield*: 6500 pages Compatible with HP 51A Black toner (per cartridge) *at 5% coverage (ISO/IEC standard) Package Contents: 2 x HP 51A Black compatible toner cartridges Q7551A Compatible with LaserJet3000, M3027x MFP, M3035xs MFP, P3005d, P3005, P3005dn, P3005x Product name: HP 51A 51-A 51 A Black Compatible toner cartridge replacements for HP 51 51A (Q7551A) Professional compatible replacements manufactured by LD Products. HP is a registered trademark of HP and is not affiliated with and does not endorse LD Products.