Page Yield*: 2,100 pages Compatible with HP 78 (Black) (per cartridge) *at 5% coverage (ISO/IEC standard) This Packages Includes the following Compatible Cartridges: 4 x HP 78 Black Standard Yield Compatible with: M501dn, M506dh, M506dn, M506n, M506x, M527c, M527dn, M527f, M527z Product Name: LD Products HP 78 Black Standard Yield Compatible Toner Cartridge replacement for HP 78 Professional compatible replacements manufactured by LD Products. HP is a registered trademark of HP Inc. and is not affiliated with and does not endorse LD Products.