PREMIUM QULAITY OF HP GENUINE BLACK TONER CARTRIDGES YIELDING 495 PAGES. COMPATIBLE PRINTERS (IF ANY): HP DESKJET 810C,HP DESKJET 840C,HP DESKJET 845C,HP DESKJET 920C,HP DESKJET 948C,HP DESKJET 3820,HP OFFICEJET 5110,HP PSC 500,HP PSC 750,HP PSC 950,HP OFFICEJET V40