Here is an interesting article on network world covering the issue that some of the Cat 5 and Cat 6 cable sold via Amazon aren't - or TIA-approved and could start a fire. Amazon is probably the price leader when it come to Ethernet cables and we have wounder for a while how some resellers can literally sell network cables below cost. Beside the actually material and labour there are other cost that a clearly cut out but some of those reellers. Read the full analysis her - http://www.networkworld.com/article/3157345/hardware/rated-insecurity-faux-cat-6-cable-sold-on-amazon.html