Contains 1/4 Lb. silver bearing lead-free solder. Safe, lead-free. Water flushable. Stays soft in cold weather. Won't separate in extreme heat. .117 In. gauge, 96% tin, 4% silver composition with 430 F (degrees Fahrenheit) melting range. 1.7 Oz. flux removes surface oxidation and provides superior wetting properties which allow better solder flow. Effective on all metals except aluminum and stainless steel.