Verbatim Remanufactured Toner Cartridge Replacement for HP C4127X (Black) Printing technology: laser Printing color: black Duty cycle: up to 10000 pages Page Yield: 10,000** Yields are based on a 5% area coverage Compatible Hardware: LaserJet 4000, 4050 Series High quality, crisp text resolution, page after page Print tested for quality prior to packaging Limited Lifetime Warranty and protection against printer damage