The product is a set of two genuine HP C4127X black toner cartridges designed for use with HP LaserJet 4000 and 4050 printers. These cartridges have a print technology of laser and come with a manufacturer warranty from HP. They are compatible with the specified HP LaserJet models and are designed to provide high-quality printing results in black color. The item height is 27X inches and the cartridges are compatible with the printers within the specified range of 4000 - 4050. Ideal for those looking to replace their existing toner cartridges with genuine HP products for reliable and consistent printing performance.