The Acer Aspire 5742 5742G 5742Z 5742ZG CPU Cooling Fan are made form highest quality parts,the laptop cpu fan are toailored made according to the original size,whether the appearance,size and quality are same with the original. The Acer Aspire 5742 5742G 5742Z 5742ZG CPU Cooling Fan keep your computer cool with optimal temperature.Every laptop cpu fan should be under strict control before leave the factory,and has passed the authentication of CE,ROHS etc.