The T0051386099 is a lead-free Solder Wire made of Sn3.0Ag0.5Cu alloy.
The T0051387499 is a lead-free Solder Wire made of Sn0.7Cu alloy. The WSW SC M1 1,0 mm solder wire is for longer tip lifetime. Flux Type: Halogen Free Solder Alloy: 99.3, 0.7 Sn, Cu External Diameter: 1mm Melting Temperature: 227°C Weight: 500g