Clicky switches, as the name suggests, make an audible click when activated. Those with a click jacket design only make a click noise on the way down. They have an internal sliding "collar" surrounding the stem that moves independently.
Standard (stainless steel)
This is a loud switch. Not recommended for use in an office environment or others that don't appreciated a loud keyboard ;)
Would avoid using in an office or quiet situation, since it is a clicky switch.
Lubing will ruin the click, which could be good or bad depending on you.
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