EBC 20-24 Audi S6 2.9TT (w/Cast Iron Rotors) Redstuff Rear Brake PadsThere are TWO reasons our customers love Redstuff, First because they are the lowest dust pad we have encountered by reducing dust by 60 90 percent. Plus the minimal dust you see is very easily removed with a simple sponge wash as it contains no steel fibre particles as in ALL OTHER pads. Second they brake like an alligator right from cold (as good as Original pads or better) and just get better as they heat up. This material is a Synthetic Fiber