On all AC industries brake rotors (front or rear) and all rear drums.
These are all made from G3000 SAE flake iron.
Most rotors and drums made in the world are made from either G1800 to G2500 flake iron.
Regarding G3000, the number specifies that the iron will be a minimum of 30,000 lbs tensile strength. This is extremely strong and is significantly stronger than the G1800 (18,000) to G2500 (25,000) specification used by most other manufacturers.
G3000 is the same iron material that would normally be used for 5 ton trucks!!
On all AC Industries adapter brackets we use nodular iron, not flake iron. This has a higher strength when it comes to rotational load. Stock VW crankshafts are now made from the same material.
AC Industries do not use any stamped metal brackets like other manufactures as these flex and bend and are dangerous!
A solid brake bracket translates to a good solid brake pedal!
I consider these to be the best made disc brake kits on the market today and it is important to remember that there are other products on the market that are a long way from matching the quality and safety of these kits.....remember that safety should be your first priority!