This is for a lot of 50 vintage oxidized copper 12mm jump rings. These are 1mm thick which is 18 gauge. (I do not have a wire gauge measure so I use my millimeter gauge. These are 1mm thick which I am pretty sure is 18 gauge.) New/old stock. **These were hard to photograph the exact color. They look more brass in the photos. These are definitely oxidized copper (blackish red).