/diy/ - Do It Yourself

I made a PCB game-controller for my smartphone. It works fine but I used those cheap mechanical buttons everywhere on aliexpress and they are noisy as hell.

I've seen PCBs from xbox controllers and the like and it's just a silicon membrane and some weird footprint on the PCB. Does anyone know a name for those things? The thing on the PCBs? Looks greyish, like carbon or something.

Or does anyone have experience with pic related? Are they quiet? Still, I only find it really small (4x4mm), I'd like them like my 12mm mechanical ones.