- Get true HP LaserJet print quality with the microfine toner formula and toner cartridge technology in the HP 43X LaserJet Toner Cartridge. HP delivers sharp black text and consistent, professional results for as long as the cartridge lasts. - Enjoy low maintenance, trouble-free printing. HP Smart technology[1] in the toner cartridge and your printer makes HP supplies easy to install and maintain. Receive automatic alerts when a cartridge is low or out. Enjoy convenient, on-line ordering. - Smart choice. HP Smart Printing technology[1] makes automatic adjustments to optimize print quality and enhance reliability. The HP 43X Toner Cartridge provides reliable operation to minimize user intervention and improve productivity.