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I just tried doing some information gathering myself and I will admit that these are hard rotors to find a wiki of some sort on.
I was however able to find out this:
"StopTech's racing AeroRotors® are cast at Pilenga S.p.A., a world class 56-year old rotor foundry that is ISO9002 and Vision 2000 certified, and is the second largest rotor manufacturer in Europe."
I know that StopTech's are a big brand, so hopefully you find it comforting that they come from the same factory. I'm sorry I can't be of more help.
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