High purity copper litz tonearm wire in a traditional silk covering. Sold as a fixed 1 metre length — enough to rewire one tonearm, and possibly two, depending on the arm and how the wire is used.
The set is four separately coloured wires — both channels, signal and return, for a full rewire from the cartridge tags to the base of the arm. Each 0.3mm wire contains 7 strands of Ø0.07mm high purity copper, enamel coated.
The silk needs removing before you can tin the copper. The best way is a solder pot: burn the silk away, scrape off the residue with a fingernail, then tin the enamel-coated copper underneath. Without a solder pot it can be done with a generous amount of solder on an iron tip, though this is less controllable.
The copper strands themselves are enamel coated, so the ends need tinning by around 5mm before use — the heat burns off the enamel and lets the solder take. Without it you are soldering onto insulation and get no connection. This wire is best used by someone with soldering experience.