Premium Quality CF237A (HP 37A) Toner Cartridge compatible with the HP LaserJet Enterprise Flow MFP M631h, Flow MFP M632z, Flow MFP M633z; M607dn, M607n M608dn, M608n, M608x, M609dh, M609dn, M609x; MFP M631dn, M631z, M632fht, M632h, M633fh . The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com