The OEM HP 61X Black Toner Cartridge is a genuine/original product manufactured by HP specifically for use in HP printers. It is compatible with models such as the 4100, 4100mfp, and 4101mfp. This black toner cartridge utilizes laser print technology and comes with a manufacturer warranty of 3 months. It is designed to provide high-quality prints and ensure compatibility with the specified HP printer models. Perfect for users looking for reliable and efficient printing supplies.