Black Toner for Lj 4L 4ML 4LC 4P 4MP 4PJ Compatible with HP LaserJet 4L, 4ML, 4P and 4MP (PX) Reduces costs, maintains quality and helps the environment by using premium empty toner cartridges Meets or exceeds OEM performance Use of new long life drum vs. refinished drum Lab-tested components each batch tested and scientifically matched for every cartridge