maddangerousSadly this set is not compatible with Corsair or Razer boards. However, this set wouldn't be that great for the K70 anyways since the LEDs would not shine through the keycaps :P
If you would like a higher quality doubleshot PBT set that does shine through and is compatible with the K70 and other "gaming" layout boards as well as standard layouts then I recommend this set: https://www.ikbckeyboard.com/product-page/vortex-backlit-doubleshot-pbt-keycaps
I use it on my Corsair K70 LUX with red LEDs and it looks and feels spectacular.
AndreNCorsair, Logitech and Razer thought they were being so creative when they were just making the lives of people that bought these keyboards harder lol.
maddangerousI have a Corsair K60 (really old model), and only most of the keys are mechanical. I got this set just so I could replace *most* of the keys. If I ever get a keeb that will look great with non-shine-through keys as well, I'll move these keys to it instead :D.