Audi A6 A7 S6 S7 2012-2018 The skid plates are Made of 5052 4mm thick Aluminum. All necessary hardware is included. We at Four Rings Auto Service and Sell Audi and VW we saw a need for a better solution to the stock plastic skid plate that break or get ripped off if your car is lowered or hit something. This skid plate helps protect against that.