Quiet Mute Micro Switches
The mute micro switch has 6.2*6.2*6.5mm size and dia 3mm button.12VDC 0.5A rating,as well as 70+/-20gf operation force,the button can be selected by kinds of color.
And they deliver, clicks are truly silent compared to regular kailh micro switches,
they require less force and feel rather dampened, not hollow like most mice.
Of course i immediately disassembled it to see how the magic happens... don't turn it on, take it apart!
The mute quiet micro switches with red buttons by Kailh,it's the Kailh MI62XX Micro Switch Series.
They may look non standard, but they are the same dimensions as OMRON switches
which means that you can put them into most Logitech mice, and it should work/fit