In more detail, the process of making the keycaps, double laser etching so the LED light can shine through can only (so far, to date with my knowledge) be done on ABS. I believe they were trying it with PBT, but the material was not holding up well and kept cracking, they believe it is due to the brittleness of the material. So don't count on getting any LED lit PBT keycaps. I'm not saying they're impossible to get, but according to Ducky, they haven't been able to do it. So if you really want PBT keycaps, you will have to give up the LED feature. Once again, just to make sure, don't quote me on any of that, this is just from what I remember seeing somewhere, someone asking about PBT keycaps for the Shine.