^ that,
Is just bascially under the keycap... so you can use it with any switch..
Personally I dont like it cause it gives a mushy feeling when you press it hard..
It does soften most of the sound.!
The o ring also comes in different stiffness.. and I only used the softest one.. dont know about the others..!
But then if you master using brown/blue key, you wont be bottoming out anyways
Here pics of what it looks like :
Black key no o ring.. Red key with o ring
