CE390A MICR, HP M601 M602 M603 M4555 MICR Toner - Premium NewCE390A MICR, HP M601 M602 M603 M4555 MICR Toner is a modified HP black CE390A MICR cartridge used for check printing in your laser printer. ** This cartridge is a new HP CE390A toner cartridge modified with MICR toner for check printing. The original toner was removed and replaced with MICR toner made for this model. It is a Premium New MICR toner.** Most HP laser printers can be used as a laser check printer. All you need is a MICR cartridge, check