KESTER SOLDER 24-6337-0061 Solder Wire, 63/37 SN/PB, 183°C, 1LB

was difficult for me to determine if this was actually a rosin flux core solder or not before purchasing, yes it is and a good quality product.

good flow and fast melting flux covers the metal before the oxidation starts due to a heat. Users are right about its quality.

The .062 size is perfect for point-to-point and tag board wiring in guitar amps and audio cables.

The metal formula in this solder is perfect for small and large wires

Yep

60/40 solder works most of the time, but it can have two states at once, a solid one and a liquid one, at around the melting temperature (some can be solid while some of it can be liquid). 63/37 solder only has one state when melted and it wont have part of the mixture turn solid before youre done. It makes it easier to get a good solder joint and is much more forgiving. Its not much more expensive than 60/40 either. Just make sure you buy the right diameter for your needs.

It speaks quality, does what it’s supposed to. Has flux core, and is meant for wire and circuit soldering!