Yes I've seen those type Paul. Strangely I have also yesterday received similar led's albeit just on the pcb's without wires, too big for my custom cars - the APA102 2020 is 2mm square & only just fits, yesterday's arrival are for use in a garden wall.
After wiring the 50 they'll be potted into a clear resin to fully seal, then embed into the wall's top layer of stone work via cement. This type are a bit 'fussy' on timing as the data-frame needs to adhere to a critical specification, whereas the APA102 type have separate Data & Clock input/output pins enabling a bit-bashing approach with code (I use a PIC on these) but the WS2812 type have some awesome Arduino libraries yielding excellent shows!
Using un-screened data wires that are in close proximity to clock lines can give problems, thus reducing my clock rate to minimise cross-talk, albeit i'm only running a few centimetre lines it's good practice.
Yes the wire is enameled wire, I used it extensively on my first cpu project (whilst at college in the 80's), a basic 8085 cpu based board.