This pack includes 5 drum cleaning units for use with WC7525, WC7530, WC7535, WC7545, WC7556, WC7830, WC7835, WC7845, WC7855, WC7970, C8030, C8035, C8045, C8055, and C8070 printers.These units are compatible with the specified models and are designed to replace the drum cleaning components.They are constructed from materials suitable for normal printer and intended to restore functionality.Installation follows the same procedure as the part and requires no special tools or professional assistance.