These are our own individually-addressable RGB LED rings. They are connected and driven the same way as Adafruit NeoPixel Rings.
Connections are made to 2.54 mm / 0.1" pitch solder pads. Care should be taken not to support the LED ring from the solder pads.
Inside diameter approximately 35 mm, outside diameter approximately 50 mm. There are four 2 mm diameter mounting holes in the ring spaced at 90° intervals on approximately 46 mm centres.