The state of California requires a Prop 65 warning label on Brass Products. Prop 65 warning labels inform consumers that the product contains chemicals on the State of California’s Prop 65 list. Brass products contain small but detectable amounts of lead—an element included on the Prop 65 chemical list. Brass has a decades-long history of successful use in jewellery making. Even though a product may be found to contain a Proposition 65-listed chemical, it does not mean that use of the product will cause cancer, birth defects or other reproductive harm. Nor does it mean that a product is unsafe.