Genuine HP toner cartridges produce the best performance from your laser printer. With JetIntelligence technology, each cartridge helps provide crisp and clear print output every time. This twin pack contains 2 black, high yield toner cartridges with a page yield of up to 18,000 pages per cartridge. For use with HP LaserJet Enterprise M506/MFP 527 and LaserJet Pro M501 series printers.