Based on the edge codes, it appears that Shandong Gold Phoenix Co., Ltd. is supplying the material for certain part numbers. Does anyone know who these guys are?
Edit: It looks like Brembo owns part of the operation:
https://www.brembo.com/en/company/news/brembo-gold-phoenix-leading-friction-technology
Edit: It looks like Brembo owns part of the operation:
https://www.brembo.com/en/company/news/brembo-gold-phoenix-leading-friction-technology