Oatey, 53180, 1 OZ, Safe-Flo Silver Lead Free Plumbing Wire Solder, A Unique Patented Alloy Of Tin, Silver, Copper, & Bismuth, Meets The Requirements Of The Safe Drinking Water Act For Use On Copper Potable Water Lines, Alloy Provides Excellent Flow & Fill Characteristics & A 40 Degree Fahrenheit Working Range, Use With Any Quality Oatey Paste Or Liquid Flux, Oatey #95 Tinning Flux Is Recommended, Carded.