Rseeing the Prop 65 warning on this product, can you share What about these knobs can expose me to lead & nickel? (Top Knobs Lynwood 1-1/4" (32mm) Kinney Cabinet Knob (Honey Bronze))

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Rseeing the Prop 65 warning on this product, can you share What about these knobs can expose me to lead & nickel? Top Knobs Lynwood 1-1/4" (32mm) Kinney Cabinet Knob (Honey Bronze)