I don’t know much about these. A buddy of mine owned a company and he was on auto ship with the rental company receiving these. He did not ever use these and no longer has that company so I’m selling them. It’s brand new in the box, the only thing I ever did was open it just to take a picture.

This is what Google says about it

This is an Innovera brand monochrome laser toner cartridge designed for MICR (Magnetic Ink Character Recognition) check printing.It is a compatible replacement for the HP Q5942A (also known as HP 42A) cartridge.The cartridge is specifically engineered to work with HP LaserJet 4240, 4250, and 4350 printer models.The manufacturer part number for this specific unit is listed as IVR-5942MICR.