Prop 65

WARNING: This product can expose you to chemicals including nickel or lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov.

https://www.p65warnings.ca.gov/warning-translations-businesses/chemicals-listed-both-carcinogen-and-reproductive-toxicant

More information can be found on this fine web page

https://www.ppai.org/media/1854/pr-prop-65-guidebook-2007.pdf