100% brand new and high quality. Rosin flux is used to facilitate soldering. It cleans and prevents metal oxidation which allows solder to create strong, long lasting mechanical and electrical bonds. It also acts as a wetting agent, increasing the flow of solder and the efficiency of the soldering process. Cleans and prevents oxidation Increases flow of molten solder Neutral PH 7 ±0.3 Specifications: Material:Rosin Net weight: 10g Package Included: 1 x10g Rosin Soldering Flux Paste