The 4 Pack W9090MC Toner Cartridges is a set of compatible toner cartridges designed for use with HP printers, specifically the E45028dn model. This pack includes cartridges in cyan, yellow, magenta, and black colors, suitable for laser print technology. The units are manufactured in China and come in a quantity of 4. These cartridges are designed for the HP Color Managed model and are compatible with W9090MC, W9091MC, W9092MC, W9093MC, E45028, E45028DN, MFP E47528, and E47528f printers.