WEmake Lead Free Solder, Silver For all your DIY / Maker soldering and solder re-work needs Great for audio applications: 96% tin - 4% silver - 430 Degree melting Point Lead free with Rosen core 031&quot; (.8mm) diameter Ideal for use in labs, service shops, schools (STEM - STEAM), home and industry Before there was the Maker movement, there was Elenco and &quot;Learn By Doing&quot;. Elenco strives for quality with value to make their products available for everyone.