@apsturk
These are not dual layered so the effect once installed on a mechanical keyboard with LEDs looks like this:
and like this:
I can still get my hands on these keyboards:
Ducky ZeroDucky Zero Zone (all LEDs) you can see this one on the Kickstarter page, I've uploaded a video and some photos.
Scroll down to photos #7, #8, video, #10 and #11.