These keycaps will fit all Razer mechanical and optical keyboards and should also fit any Cherry-style switches from other brands.

Will these keycaps fit the switches on my keyboard?

There are 120 keycaps included in the package and they cover either US (ANSI/104) Layout, or the UK (ISO/105) Layout.

I have a backlit keyboard. Will the lighting be able to shine through the fonts?

Yes. The fonts are translucent and will allow lights from the keyboard to shine through.