HP Q7551X LaserJet 51x Black Print CartridgeUSED, open cartridge. Weight 2 lbs, 15.2 oz. Untested. If you want to bring your HP printer to see if this is working, that is fine. Ive no way to test it as it is not sealed, as in new, but used. Original HP 51X, Q7551X cartridge.Serious inquires please include your phone number.