Fuser film sleeves compatible with MF645CX, MF641, MF643, MF643CDW, LBP621, LBP623CDW, LBP621CW, 1025, M175, M176, M177, CP1025NW, M251, and 276 models.Designed to support thermal fixing process in laser printers, these sleeves assist in transferring toner to paper through consistent heat and pressure.Each sleeve is built for durability and smooth within the fuser unit.Replacement part intended for use in maintaining print performance over extended usage cycles.