Illumicore Crystal
Smart LEDs with embedded WS2812 IC in a 5050 package on 10mm diameter PCBs. They operate in the same color order as pixel strips. The PCBs are integrated directly into the epoxy resin with an extremely strong bond.
A small 75ohm resistor is on the pcb but the use of a 330ohm external resistor is recommended.
The PCBs have 6 pads offering 2 positions each for +V and GND and one pad each for Data In and Data Out.
Roughly 10mm X 10mm X 35mm (0.39"x0.39"x1.378")