This product is a set of 4 black toner cartridges compatible with HP printers including LaserJet Pro M15, M15a, M15w, M28a, and M28w models. With a page yield of 1,000 pages for black printing, these cartridges are suitable for home, office, or professional photo use. They are equipped with the latest chip technology and come with a manufacturer warranty of 2 years. Orders are dispatched on the same working day, and customer support is available with a 24-hour response time. Made in the United Kingdom, these cartridges are designed to deliver high-quality printing performance for a range of compatible HP printers.