I bought this as an upgrade for my B8 S4 but when I went to fit I discovered they won't fit inside my standard 19" wheels. So if you are going to fit this kit you need at least 20" wheels.
What's included :
Pair of red Bentley Continental GT Alloy-Bodied Twin Pot Calipers
Pair of red caliper carriers
Pair of good used 420mm discs
Set of good used pads
Pair of brake guards
All bolts, screws, brake lines - as per the picture.
I bought these as they are supposed to be a direct bolt on upgrade. No messing with brackets etc. But I've not fitted them. I tried them inside my 19" wheel and when they didn't fit I didn't go any further.
They have only covered 10,000 miles from new and are great condition as you can see from the pics :

