Phosphorus copper rod, Dnepropetrovsk region.

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The rod of the PMF9 brand belongs to medium-melting solders, has high fluidity and good corrosion resistance to aggressive media. They are used for soldering copper and its alloys (bronze, brass, nickel). They can also be used as a substitute for silver solders when repairing jewelry.
A distinctive feature of copper-phosphorus solders is that they are self-flowing. When soldering copper products with them, the use of flux is not mandatory.(//tractor-service.com)
Rods F 3 mm, length of rods 400 mm.

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