These are used for general purpose soldering works on TV and electronics manufacturing and repair. They consist of 5 channels and contain 2.5% flux. The residue and mark they leave after soldering are safe, and cause no surface tension or corrosion.
KURTEL Sn60Pb40 SOLDER WIRE RA26 TDS
KURTEL Sn30Pb70 SOLDER WIRE RA26 TDS