Drum Cleaning Lubricant Bar Wax Roller Compatible with MPC4504, MPC4503, MPC5503, MPC6003, MPC3503, MP C6004, C5504, C3003, C3004, C3503, C3504.This lubricant bar is designed for use in the drum cleaning system to maintain proper of the imaging drum assembly.It applies a thin, uniform layer of wax-based lubricant to the OPC drum during normal , supporting consistent toner transfer and cleaning function as intended by the design.