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

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

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

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.

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.

Yep

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