Hex-O has two matte black PCBs in the shape of hexagon. One PCB has 8 back-soldered RGB LEDs in a circular pattern. The LEDs are driven by a programmable SAMD20 micro-controller. The other PCB has a CR2032 battery holder.
The hexagon is about 40mm by 36mm. The length of each side is about 20mm and the diagonal length is 40mm. Hex-O could be assembled together easily with M3 Hexagon nuts.