This is 0.020 diameter solder, excellent for the precision soldering that is required to connect LEDs.
Sold by the foot.
It is flux-cored with a no-clean flux.
It is 63Sn/37Pb for ultra low melting point, excellent wetting properties and relatively high bond strength
It takes approximately 4 inches of solder to solder one single LED (consisting of two soldered joints).
Lead-Free or PB-Free solder is not recommended due to the significantly higher temperatures required for it to melt. If used on an LED, it will likely reduce the lifespan of your LED and cause premature failure