This listing includes four charge rollers, also known as PCR units, designed for use in AltaLink multifunction printers.These components are compatible with the following models: C8030, C8035, C8045, C8055, C8070, C7525, C7530, C7535, C7545, C7830, C7845, and C7855.The charge roller functions to apply a uniform electrostatic charge to the photoconductor drum during the printing process.This set is intended to replace worn or damaged rollers to restore standard machine and maintain consistent print quality.Installation involves removing the existing unit and inserting the roller into the designated slot within the printer imaging system.