Using high quality Rosin Core Solder materials, uniform heating and excellent flowability make soldering a breeze. Easy to be soldered, flows smoothly, soldering fast and strong soldering point. Less smoke and rosin splash while soldering. Bright and strong soldering points. Plus there's less residue after soldering. Application for DIY, home improvement, repair of cables, radios, TVs, VCRs, stereos, headsets, motors, toys, circuit boards and other electrical devices. Tin (Sn) 97% Silver (Ag) 0.3% Copper (Cu) 0.7% Flux 2% CI (Flux) <0.1% Expansion >75%