toner cartridges manufactured by certified manufacturer by CE, ISO 9001, ISO14000 and STMCIt always print crisp,clear,legible,and cleanlyOur jobs are providing the premium quality products and professional services to make you satisfiedCompatible HP 80A CF280A Black Toner Cartridge Chip )HP - LaserJet Pro Series Laser Jet Pro M401a LaserJet Pro M401Dw LaserJet Pro MFP M400a 

• Simple installation user:

Step 1:Gently rock the cartridge back and forth to spread the tonerStep 2:Pull out the entire sealing tape from the toner cartridgeStep 3:Remove the black paperStep 4:Install the toner cartridge into printerAll the brand names and logos are registered trademarks of their respective owners. These products are NON-OEM.