This unit is the MICR version of the HP CF237A toner cartridge. This MICR toner bleeds red upon chemical alteration. The cartridge yields 11,000 pages with 5% coverage. TROY MICR toner is the highest quality MICR toner available and is the only toner HP endorses. TROY MICR Toner will not void your HP warranty. Device Types: Laser Printer; Color(s): Black; Page-Yield: 11,000; Supply Type: MICR Toner Secure™.