The first cables I had to return it because it was on a point so strongly bent that there could only be a cable break eigendlich.
Unfortunately, the second cable supplied was not perfect, but I have given the ganzenmal a chance.
And it is serving, at least could not detect any impairment.
However, I have not the opportunity by mete out such a cable.
Due to the external defects (because it twice) but this was my first and last purchase of network cables on Amazon.
I'm guessing here simply times that the storage conditions of such products are not obtimal / were.
That may be different, I can neither prove nor understand, is just my personal opinion.