Review on 🔌 Quality Tin Lead Rosin Core Solder Wire by AxPower - 5-Pack Assortment with 0.5mm to 1.2mm Diameter for Effective Electrical Soldering (50g Each) by Luca Washington

This is the worst solder I have ever bought and have been soldering since the mid 80's. The chemical composition of the metal is questionable, the rollers are not marked. It certainly doesn't work like 63/37. In addition to the already poor performance, the flux content is completely inadequate. This solder just never "flows" and it seems like every connection is a cold joint. It doesn't matter what temperature you set, immersion time, connecting cables, soldering components, etc. It seems to suck for all applications in the same way. For this reason I still buy solder to work with small electronics (it sucks and flows better) totally zeroed out here.