Are a brand from adafruit. The LED is WS2812. Alternative is PL9823
Available in 5mm, 8mm, and smd.
The pins on 8mm (PL9823-F8) starting on the flat side. Longer pin, logest pin shorter pin, shortest pin: data-out, ground, power, data-in.
The pins on 5mm (PL9823-F5) starting on the flat side. Long pin, long pin, short pin, short pin: data-out,ground, power, data-in.