They dont look or feel isolated, like ones inside a headphone cable
It’s usually a thin resin/epoxy coating so it’s transparent and has a similar slick feeling as the metal would. The same coating can go over the leds so it’s fully waterproof.
They are all insulated
There is a nonconductive coating on the wire that also prevents it from oxidizing. The wires can touch, but if the coating isn’t scratched it won’t short.
Some fine grit sandpaper will reveal the metal so you can solder connections.
will also see it sold as “magnet wire” (for winding your own electromagnets) and the heat from your soldering iron is usually enough to melt through the enamel varnish
That’s generally not recommended as a way of stripping them though, since the coating is often made of polyurethanes, which release alkyl isocyanates (highly toxic) when heated strongly. While a small amount in a well-ventilated area might not be enough to give you any problems, if you get too much it is very bad. The organic material will also impact the ability to solder. Better to scrape it off first.
Yeah, those kinda puzzled me as well. They didn’t look like they’re varnished, but I suspect I could be wrong about that. After all, they do work, lol 😂.
It works for now, but the reason most wires have a rubber-like insulator around them is that it takes very little to Crack or abrade a thin coating such as this and turn it into a fire hazard.
I’m surprised a product with such a small safety margin is allowed for sale.
They’re called enameled cables, they’ve got a thin layer of insulation which prevents them from rusting or shorting.
To add, enameled wires are also used in motor windings and old CRT monitors (deflector windings). The easiest way to identify it is to scratch with a knife or burn a small portion of the wire to see if the enamel separates.