Hello there!
There is a worrying trend in the cable industry that is impairing the final consumer: counterfeit cables. Companies are doing this shady deal by selling under brand cables labeled as a genuine products, but without the quality controls and even without the appropriate metal inside them. It is a $500 billion problem worldwide. This article explains the information regarding counterfeit cat5e, cat6 or Cat6a cables.
I think is important to all of us working in networking.
https://goo.gl/8DxxK7