Inclusions: 5 Pack Compatible 78A CE278A Black Toner Cartridge Compatible Printers:: M1536dnf, M1537dnf, M1538dnf, M1539dnf, P1566, P1606dn Page Yield* Per Cartridge: 2,100* For best results, store in a cool, dry place. Use within 3 years of purchase for optimal performance. *Average cartridge Page Yield* in accordance with ISO IEC 24723. *at 5% coverage (ISO/IEC standard) Deliver vivid, crisp text and graphics. Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.