Premium Quality CF287A Black Toner Cartridge compatible with the HP LaserJet Pro M501n, M501dn; LaserJet Entprise M506n, M506x, M506dn, M506dh; LaserJet Enterprise Flow MFP M527z, M527dn, M527f. The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com