Each genuine Lexmark B342000 toner cartridges offers laser printer users an estimated 1,500 prints, making this a surprisingly cost-effective purchase. The lexmark B342000 toner cartridge contains some of the highest quality black toner powder available, meaning each print is crisp and well presented.As a high capacity capacity Lexmark return program cartridge, the B342000 reduces the running costs of all compatible mono laser printers. You can use the black B342000 in a variety of top-quality Lexmark laser printers, including the MB3442i.