Why do motorcycle regulators have prop 65 California cancer warnings?

I just ordered a regulator for my honda cbr600rr and I noticed something weird, some of them from all kinds of different companies have the california prop 65 cancer warning, some don't, some say "may" have chemicals that cause cancer, some say "do" have them? What's really going on? So some companies just not put the label up but it still applies? Are some made differently?

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