Genuine HP toner cartridges produce the best performance from your laser printer. With Jet Intelligence 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 Laser Jet Enterprise M506/MFP 527 and Laser Jet Pro M501 series printers. Colour: Black Page Yield: 18, 000 Pages per cartridge For use with HP Laser Jet Enterprise M506/MFP 527 and Laser Jet Pro M501 series printers Laser Jet with Jet Intelligence technology High yield What s in the box: 2 toner cartridges Selectability: 87X 100% of Original HP toner cartridges contain recycled content