MSE's HP® CP4025/CP4525 cartridges contains the new Secondary Cleaning System Technology (SCS), which keeps the PCR totally clean of toner additive throughout the complete life of the cartridge, which is especially critical with faster speed (42 ppm) and higher yielding (8,500 – 17,000 pages) cartridges. Thus eliminating many historical issues in print defects such as streaking, dirty print, and backgrounding. For more information please Click Here