CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
Wire-type soldering tip cleaner for use with soldering iron tips.
Brass coils are softer than soldering iron tip plating, but harder than the oxidation that forms when soldering.
No water necessary.
Extend the life of your soldering iron tips by keeping them clean
Reference:
77-STC