Smart Print Cartridge is designed for use with HP Color LaserJet 4600/4650. Achieve accurate, consistent color and the best performance your HP Color LaserJet printer has to offer with HP Color LaserJet print cartridges. Chemically-grown toner formulas in HP print cartridges are designed together with the printer. The uniform size and spherical shape of HP toner particles ensure a broad range of colors and precise control and placement for accurate color and precise image reproduction. Smart printing system technology tunes particle charge for consistent color, even in high humidity. (Using genuine HP supplies ensures availability of all HP printing features.) Simple installation and reliable operation save you time and lowers overall printing costs.