50% tin, 50% lead solder. For use only in non-potable water applications. Larger 16 oz. spool for convenience. The wire is 0.125 in. Dia.50% tin, 50% lead solderFor use only in non-potable water applicationsLarger 16 oz. spool for convenience0.125 in. Dia wire. WARNING: This product can expose you to chemicals including lead, which is 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. Wash hands after handling.