Legit Reviews posted a review on the Corsair PBT Double-Shot Keycaps
A quote from the article:
It all started with a post in the Corsair User Forums back on February 5th, 2016 by Corsair Henry. Henry asked the Corsair community who wanted to buy double shot key caps if they available to purchase and how much money would they be willing to spend. That forum topic has garnered over 300 posts since then and it appears that was enough for Corsair to launch a product as you can now purchase Corsair Gaming PBT Double-Shot Keycaps for K95, K70, K65, K66, K63 and STRAFE keyboard models. Read on to see how the switch from ABS to PBT keycaps went!Corsair PBT Double-Shot Keycaps Review @ Legit Reviews