The 201A Toner / 2 Pack Black by PMI Color CF400A is a compatible black toner cartridge designed for use with HP printers, specifically the M252DN model. This laser print technology toner is manufactured in China and offers high-quality printing performance. The 2 pack ensures that users have a spare cartridge on hand for when they are running low on ink, allowing for uninterrupted printing without the need for frequent refills. Overall, this product provides a reliable and cost-effective solution for achieving professional-quality black prints with your HP printer.