What Does The Silicone Keyboard Pad Do?

Silicone pad/mat has two functions

One is Use like a spring，  Almost all mechanical keyboard subkeys use silicone instead of springs. When you hit the keyboard, it feels good and the sound is relatively low. It is not as stiff as a spring, but its life is shorter than a spring. Only high-end mechanical keyboards use springs, which are expensive.

The second is dust-proof, waterproof etc