I just bought these brake pads from amazon (the resin variant, NOT the semi-metallic variant, see picture), and even though they are supposed (?) to be non-metallic, I can see small amounts of a glossy substance that very much looks like metal. Color wise I'd say it's closest to copper.
I'm asking because the semi-metallic pads I used previously shredded my last pair of rotors which, as I only found out afterwards, was only meant for resin pads. I replaced the rotors now with another very cheap pair that is also for resin pads only, and I would like to make sure I don't shred it again.