Black Print Cartridge with ColorSphere Toner (10,500 pages) for HP CM3530,CP3520,CP3525 Printers. The fast, easy, trouble-free performance of Original HP printing supplies can make the whole office more productive. The printing system is tuned to the unique properties of improved HP ColorSphere toner so you get brilliant colour and reliable, consistent performance from everyday documents to marketing materials. Take advantage of built-in cartridge intelligence that enables time-saving supplies management features to reduce administrative time and keep your office printing running smoothly.