HP LaserJet 4000, Laserjet 4050 series laser printers - Black Toner Cartridge by Dataproducts (10k yield) (same as HP # C4127X)

HP LaserJet 4000, 4050 & Troy 617 laser printers MICR Toner for printing checks (High Yield) (10,000 Yield)

HP LaserJet 4000, 4050 series laser printers - MICR SECURITY Toner for printing CHECKS (approx. 10,000 Yield). This toner creates a red stain if text alteration is attempted.