描述: 331 Organic Flux Core Solder - .031'' 21 Gauge Extremely active More effective than rosin fluxes when soldering difficult metals such as copper, nickel and brass High heat stability allows for minimal smoke and odor Water soluble 1 lb. .031" diameter Alloy Tin/Lead: 63/37 Spool Size: 1 lb dia: .031" Gauge: 21